Why do we only see four trophic levels in most food webs?

Answers

Answer 1

Answer:

Usually there's not enough energy left to support any additional levels.


Related Questions

Please help with d and explain

Answers

The answer would be AB+40.

Which best describes the flow of genetic information?
A. Protein to DNA to RNA
B. DNA to RNA to protein
C. RNA to DNA to protein
D. Protein to RNA to DNA

Answers

DNA to RNA to proteins

Answer:

B DNA to RNA to protein

Explanation:

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The total wind power capacity in the united states in 2000 was about 2540MW. By 2015, the total wind power capacity in the United States was about 72,500MW Calculate percent change in the total wind power capacity in the United States from 2000 to 2015. Show the work

Answers

Answer:

2754.33% increase

Explanation:

The total wind power capacity in the united states increased between 2000 and 2015. The percent change in the total wind power capacity in the United States from 2000 to 2015 is given by the formula:

Percent change = [(total wind power capacity in 2015 - total wind power capacity in 2000) / total wind power capacity in 2000] * 100%

Percent change = [(72500 MW - 2540 MW) / 2540 MW] * 100%

Percent change = 2754.33% increase

Power is the amount of energy transferred or converted per unit of time. In the International System of Units, the unit of power is the watt, equal to one joule per second.

The total increase is 2754.33% increase

The total wind power capacity in the united states increased between 2000 and 2015. The percent change in the total wind power capacity in the United States from 2000 to 2015 is given by the formula:

Percent change = [(total wind power capacity in 2015 - total wind power capacity in 2000) / total wind power capacity in 2000] * 100%

Percent change = [tex]\frac{[(72500 MW - 2540 MW)}{ 2540 MW }* 100%[/tex]

After solving the equation the percent change = 2754.33% increase.

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1. Which statement is NOT true about chemical and physical changes?
A. Chemical and physical changes could produce precipitates.
B. Chemical changes produce new substances, but physical changes do not.
C. Physical changes use energy transferred as heat, but chemical changes do not.
D. Physical and chemical changes could require days for their effects to be noticeable.

Answers

Answer: A. Chemical and physical changes could produce precipitates.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

Explanation:

Drag the tiles to the correct boxes to complete the pairs. Match the descriptions to the correct type of fungi. has positive and negative mating strands has erect fruiting body the first fungi to evolve lives in a varied habitat and exhibits all forms of nutrition chytrid arrowRight common mold arrowRight sac fungi arrowRight club fungi arrowRight

Answers

Answer:

Fungi are unicellular or multicellular eukaryotic organisms that are dependent for their energy and food on dead organic material or other organisms. These organisms produce by both sexual and asexual reproduction.

1. club fungi show a bipolar mating system as they have positive and negative mating strands.

2. sac fungi have an erect fruiting body filled with asci.

3. The chytrids have a cell wall of chitin, a flagellum, absorptive structures for nutrition therefore have a lineage.

4. The common molds grow in the form of hyphae and shows all for of nutrition and live in every possible habitate.

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Identify the phenotype of the offspring represented by the question mark in Figure 11-4:

Answers

Answer:

The guinea pig's phenotype (physical appearance) will be rough white hair

What human factor has an impact on the flooding of the Yangtze River

Answers

Answer:

Deforestation directly increases erosion and siltation rates. There is an increased risk of flooding in Yangtze River basin in China and the major river basins in East Asia and the Amazonian basin .

Explanation:

Which type of development occurs in humans? Internal development or External development? Explain your answer.

Answers

Answer:

internal development

Explanation:

A female Carries it's baby inside, and it grows there till it is ready to be delivered

Answer:

internal

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What causes stomach cramps?​

Answers

Answer:

the main causes are, infection,abdominal growth,inflammation,obstruction blockages

Explanation:

“Stomach cramps” is a general term that refers to sharp, intermittent contractions or feelings of pain or discomfort that occur anywhere in the abdomen between the lower chest and the pelvis or groin. The abdomen consists of many organs, including the stomach, intestines, liver, gallbladder, pancreas, esophagus, and numerous blood vessels.

Stomach cramps are a common symptom of a wide variety of mild to serious diseases, disorders and conditions that are often related to the abdominal organs and sometimes the pelvic organs, such as the uterus and bladder. Most people will experience stomach cramps at some point during their lifetime, and they can occur in any age group or population. Common causes of stomach cramps include indigestion, gastroenteritis, menstrual cramps, bladder infection, and excessive flatulence (gas).

Stomach cramps may be generalized, which means they occur throughout the abdomen. Stomach cramps may also be localized in a small area of the belly, such as the lower abdomen or pelvis near the groin, or in the upper abdomen where the stomach is located.

Depending on the cause, stomach cramps can last for a few minutes or hours, such as when they occur from indigestion due to eating rich food or from vigorous exercise. Stomach cramps can also last for a few days, such as when they are due to a menstrual period. Long-term stomach cramping may be continuous or occur periodically and may be due to more serious conditions, such as colorectal cancer.

In some cases, stomach cramps may be caused by serious conditions, such as food poisoning or colorectal cancer. Seek prompt medical care if your stomach cramps are unexplained, persistent, or cause you concern.

Stomach cramps may accompany other symptoms, which vary depending on the underlying disease, disorder or condition. If you have other symptoms along with stomach cramps, be sure to inform your health care provider. This information will help your doctor diagnose the reason for your stomach cramps.

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The number of males and females of each age in a population is described as the
O carrying capacity
O age structure
O demography

Answers

Answer: age structure

Explanation:

1. Who is widely considered to be the
father of genetics?
A. Gregory Mendel
B. G. H. Hardy
C. William Bateson
D. Reginald Punnett

Answers

Answer:

a. Gregory Mendel

Explanation:

Gregory Mendel is the father of genetics

Gregory Mendel is widely considered to be the father of genetics

Option A is correct

How do we explain?

Gregor Mendel was an Austrian monk and botanist who is considered to be the father of genetics. He conducted experiments on pea plants and was able to formulate the laws of inheritance, which are the basic principles of genetics.

Mendel's work was not widely recognized until the early 20th century, but it has since had a profound impact on our understanding of genetics. His work laid the foundation for the study of genetics and has helped to advance our understanding of how traits are passed down from parents to offspring.

Therefore, Option A is correct

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A farmer uses genetic engineering to inject dairy cows with a genetically altered hormone (GAH) to result in the production of more milk. What might be a risk of using this technology to produce milk?
A.
Use of the GAH may increase the availability of milk.
B.
Use of the GAH may increase the amount of hormones in the milk.
C.
Use of the GAH may provide extra milk to feed the poor.
D.
Use of the GAH may allow the farmer to reduce milk prices.

Answers

Answer:

B

Explanation:

A farmer uses genetic engineering to inject dairy cows with a genetically altered hormone (GAH) to result in the production of more milk, and the use of the GAH may increase the amount of hormones in the milk, which is a risk that is present in Option B.

What is a genetically altered hormone(GAH)?

The GAHs that are used in dairy farming can result in an increase in the levels of hormones such as insulin-like growth factor 1 (IGF-1) in the milk, and these hormones can be harmful to human health and are also associated with an increased risk of certain cancers, such as breast cancer and In addition to concerns about the health effects of GAHs, there are also environmental concerns. The increased milk production resulting from GAH use can lead to overproduction, and animals get harmed by these genetically altered hormones.

Hence, the use of the GAH may increase the amount of hormones in the milk, which is a risk that is present in Option B.

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The noble gases in group 18 were some of the last natural elements to be discovered. Why do you think this is so?

Answers

Answer:

because they were extremely un-reactive. Being inert, they were difficult to isolate via chemical reactions, thus difficult to distinguish as separate elements

Explanation:

The noble gases of group 18 were the last to be discovered because they are highly unreactive or inert.

Noble gases refer to elements in group 18. These elements are renowned for being inert.

As a result of their inertness and because they are all gases, they are sometimes called "inert gases".

This chemical inertness made it difficult to discover these elements until lately. Many natural elements were discovered because they participate in chemical reactions. Hence, inert gases became the last natural elements to be discovered.

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A student graphed distance versus time for an object that moves 14 m every 2 seconds. What is the slope of the ling on the graph. Please explain!

Answers

Answer:

A slope of 7, representing a speed 7 m/s.

Explanation:

Speed is defined as the distance traveled over time. Mathematically, it's calculated with the equation:

[tex]speed = \frac{distance}{time}[/tex]

Slope of a graph is the rate at which the y and x axis change together, the "rise over the run." Slope can be simply calculated using this equation:

[tex]slope = \frac{x_{2} - x_{1}}{y_{2} - y_{1}}[/tex]

Therefore, when graphing distance versus time, the change in distance is divided by the change in time to find the slope. This is the same as speed.

The three arrows in the diagram each represent a process known as?
(1) mitotic cell division
(2) meiotic cell division
(3) fertilization of gamete cells
(4) differentiation of tissues

Answers

Answer:B

Explanation:


Why could tropical rain forests be called the "medicine chest of the Earth?

Answers

Because it gives food for LOTS of living organisms
It gives lots of food

Describe one feature that a spreadsheet has
that a database does not have.

Answers

In a spreadsheet, data can be stored in a cell, while in a database, data is stored in a record of a table, meaning you must count the records in a table to express how long the data table is, not the number of the cells. And that is it – you cannot pick a font colour or size.

what does gradiant mean in biology​

Answers

Answer:

The difference in the concentration of a substance between two areas is called the concentration gradient . The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse.

Explanation:

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what was worked D.R Aklilu Lema ? and what is his reasarch?​

Answers

Answer:

In 1964 a young Ethiopian doctor, Aklilu Lemma, discovered that suds from the fruit of a common African plant, the endod or soapberry, which African women have used as soap for centuries, act as a potent molluscicide. ... And Lemma's early research confirmed this potential.

A “year” on Earth is 365.26 days long. A “year” on Saturn lasts over 29 times longer than Earth. Which of the following best explains this difference between the two planets?

Saturn is farther from the Sun than Earth.

Saturn rotates on its axis faster than Earth.

Saturn has greater gravitational force than Earth.

Saturn revolves around the Sun faster than Earth.

Answers

Answer: Saturn is farther from the Sun than Earth.

Explanation:

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How are Earth's structures created over time?

Answers

Answer:

Earth crust is constantly changing primarily due to plate tectonics (plate motion), but it also changes from activity on the surface from river, man made and meteorite impact. ... Continents and oceans do not ride atop the plates without changing. As the plates move and change so do the continents and oceans

Answer:

Explanation:

Earth's structures were created when the planet was first formed. Over time, its own gravitational and magnetic forces drove the Earth's core rotation.  Other geological activities affected its structures; such as glacial movements, tectonic plates collisions and submersion, volcanic eruptions and so on. There were also major external events the asteroid impact that killed most lives on Earth. Human activities' impact on Earth's structures were relatively small until the recent centuries.

Bacteria are used in food industry for the production of ?
(a)curd
(b)cheese
(c)butter
(d)all of the above​

Answers

Answer:

D.) All of the above

Explanation:

Bacteria has become a major component in the processing of dairy products because of various factors. The distribution of bacteria aids factors like ripening and flavor development of cheese and curd and also aids fermentation.

Curd, cheese and butter production all involve the use of bacteria.

The bacteria commonly used to make curd is lactobacillus bacteria.

The bacteria commonly used to make cheese are lactococcus, lactobacillus and streptococcus genera

The bacteria commonly used to make butter are lactococcus and leuconostoc .

A plant that normally has relatively few, long internodes develops short and more frequent internodes. Which
of the following is the most likely factor in this?
A. the growth is high on the plant
B. the growth is late in the season
C. the growth is a response to high levels of light
D. the growth is early in the season

Answers

Answer:

B

Explanation:

Which of the following statements is true?
OA. Chromosomes make up proteins.
OB. Genes make up cells.
OC. Chromosomes make up genes.
OD.
Genes make up chromosomes.

Answers

D: genes make up chromosomes

PLEASE HELP ME FILL IN THE BLANKS ASAP!!!!!!!!!!!!!! GIVING AWAY 18 POINTS!!

Answers

1. D. Marine

2. A. Desert

3. E. Freshwater

4. C. Grassland

5. B. Tundra

If there is a #6, then the answer would be F. Tropical rainforest

Long chains of amino acids are

sugars.

proteins.

lipids.

carbohydrates.

Answers

Answer:

Amino acids form proteins

The red shift of light from most galaxies is evidence that

Answers

Astronomers have discovered that, in general, the further away a galaxy is, the more red-shifted its light is. This means that the further away the galaxies are, the faster they are moving. ... Red-shift data provides evidence that the Universe, including space itself, is expanding.

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Answer: This means that the further away the galaxies are, the faster they are moving. ... Red-shift data provides evidence that the Universe, including space itself, is expanding. Redshift and blueshift describe how light shifts toward shorter or longer wavelengths as objects in space (such as stars or galaxies) move closer or farther away from us. ... When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer.

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True or false Men can be carriers of X-linked disorders?

Answers

True, X-linked disorders often are carried in males.

Answer:

True.

Explanation:

X-linked recessive diseases most often occur in males. Males have only one X chromosome.

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PLS HELP ASAP 50 POINTS!!
Select the homologous structures.

a. human arm
b. whale's flipper
c. bird's wing
d. cat's leg

Answers

Answer:

Flipper of a whale and bird's wing are homologous structures.

For more better explanation see below.

Explanation:

Flipper of Whale is homologus to the wing of a bird. Homologous organs - The structure which are similar in their morphology, anatomy, genetics and embryology, but dissimilar  in their functions.  

Flipper of whale and wing of bird has similar morphology and anatomy, but differ in their functions according to their species as  well as the habitat where they live in.

A dolphin’s flipper, bird’s wing, cat’s leg, and the human arm are considered homologous structures. Whereas human beings have bones such as the humerus, ulna, radius, wrist bones, and fingers, these features appear as similar bones in form in the other animals. Bats, whales, and many other animals have very similar homologous structures, demonstrating that these creatures all had a common ancestor.

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Answer:

Human arm and cats leg

Explanation:

How are these atoms used to make new molecules and what types of molecules are made? Where does the energy come from to produce these new molecules?

Answers

Answer:

Atoms used energy to make new molecules.

Explanation:

Atoms used energy to make new molecules through making bonds with one another because bonds allow atoms to attached tightly with each other. The energy come from the external environment in order to produce new molecules. So we can conclude that energy is the main ingredient needed for making new molecules and this energy is gained from the environment.

Answer:

I would like to help, but what are the new molecules they are producing? And what are the atoms the question is talking about?

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