Bountiful fossil bones, teeth, trackways, and other strong information have exposed that Earth was the territory of the dinosaurs for at least 230 million years. However, not a lone fragment of dinosaurs debris has been found in rocks younger than about 66 million years.
Answer - d. 66 million years ago
How does water get from the leaf to the atmosphere?it evaporates into the air spaces and diffuses through the stomatait moves by active transport into the air spaces and evaporates through the stomatait diffuses into the air spaces and evaporates through the stomatait moves by osmosis into the air spaces and diffuses through the stomata
As we know water is released in the form of water steam by evapotranspiration through the stoma, then the water steam is diffused into the atmosphere, therefore we can say that the correct answer is the third option.
I need help with this practiceIt’s from the biology section in my ACT prep guide
Composting allows the soil to grow a rich flora of microorganisms that are decomposers of the organic material present in the compost. In this way, they make nutrients more accessible to plants and other producers, benefiting the soil's quality.
The cell wall is one of the many parts of a plant cell how does the structure of the cell wall bestrelate to its function?A. By having a phospholipid bilayer the cell wall produces a flexible outer boundary.B. by having different kinds of micro filaments the cell wall increases the cell's surfacearea.C. by having multiple layers of cellulose fibers the cell wall forms a supportive outerborder.D. by having many types of protein channels the cell wall controls the movement ofmaterials.
The correct answer is C. by having multiple layers of cellulose fibers the cell wall forms a supportive outer border. The cell wall is a strong structure which gives mechanical support to the plant's cells.
How do cnidarians in the medusa formmove through the water?A. the gastrovascular cavity fills with water and allowsthem to floatB. their tentacles spin causing a propeller motionC. the tentacles move along the ocean floor like feetD. water is brought into the gastrovascular cavity andthen expelled which propels them forward
The medusas (cnidarians) is a free-swimming form organism, that is able to move through the water by rhythmic muscular constractions of the bell part (jet propulsion) of their body. Therefore, the correct alternative is the one that says: D. water is brought into the gastrovascular cavity and then expe
What will happen?This is not a test question (could you please simplify the answer?)
A tube has a semi-permeable membrane at the center with two solutions on either side. The solution on the left has a higher concentration than the one on the right. Thus the solvent will move from the righthand side to the lefthand side to get to the solution of lower free energy. This will lead to a dilution of the solution that was initially more concentrated and a concentration of the solution that was initially more dilute. The flow will continue until the two sides are equal in free energy. The movement of solvent from one side to the other, will lead to a height difference between the two sides. This height can be converted into a pressure.
I need help with this practice problem solving I will send an additional pic that goes along with this problem
Let's define our biodiversity (Simpson's) index formula:
[tex]\text{Biodiversity Index }=\frac{\text{Total \# of species}}{\text{Total \# of individuals}}[/tex]We are given a list of 5 organisms that Amy found in her backyard:
1st species: Hummingbirds
• 4 individuals
2nd species: Common dandelion
• 33 individuals
3rd species: Yellow winged blackbird
• 8 individuals
4th species: Chipmunk
• 2 individuals
5th species: Hawk
• 1 individual
From our given, we identify that we have 5 species and 48 individuals.
Solving for out BI, we substitute in the numbers to obtain our answer:
[tex]\text{Biodiversity Index}=\frac{5}{48}[/tex]Evaluating this, we can approximate the biodiversity index to be around 0.10.
The snail in layer E of image 1 is a previously unidentified species. How can scientists determine the relative age of the fossil?Answer in a short and clear answer, use your own words
The scientists will use Relative dating. It is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.
What part of seed plants contain the egg?ovulepistilantherstamen
The seeds are equivalent to eggs of animals, they contain the embryo and endosperm of the plant species, the ovary of plants where found inside the pistil, that is the structure where ovules are produced (eggs). Therefore, the part of a seed plant that contain the egg is the pistil.
If you took scissors and cut the dorsal root , would you affect the sensory or motor ?
The dorsal root is sensory, therefore if you cut the dorsal root it will affect the sensory motor.
What is genetic variation?Select one:a.The control center of the cellb.Differences with a population of the same speciesc.The selection of desirable traits in individuals that increase likelihood of survivald.Drastic changes to an environment
The correct answer is the letter
b. Differences with a population of the same species
Genetic variation in a group of species enables some members of the population to survive better in their environment.
i just need to know the answers, do not explain it please.Item number 36.
The answer would be the letter E. All of the above hinder development of new systems.
*All of the problems mentioned in the choices are matters that complex to resolved.
Which two species would most likely be able to live inthe same habitat without competition for food resources? a. Aand Cb. Band DC. Band Cd. A and E
In this case, we want to select the species that have the most different diets, if we go checking pair by pair we can see that option a, share seeds, option b share insects, option d, share both resources buts and seed, meanwhile option c have two completely different diets, species B feeds with worms and insects and species C feed from fruits and seeds, therefore the correct answer is option c.
Organisms and their habitats are in danger of destruction, since plastic is a non-renewable, non-biodegradable material that is easy to manufacture but hard to convert to environment friendly substances.Is this statement ^ accurate?Or can this be reworded to something more accurate?? Let me know
Plastics are made from non-renewable and non-biodegradable materials and are difficult to convert to environmentally friendly substances. As a result, the organisms and their habitat are facing danger that might lead to destruction, scarcity of food resources, and even death.
Which group uses Phylum in their classification?1) animals 2)water3)rocks4)chemicals
The correct answer is 1. Animals
Phylum is a level of classification or taxonomic rank below kingdom and above class.
Suppose cellular respiration occurs inside an insulated, sealed container. How does the container's weight change during the reaction?decreasesdoes not increase or decreaseincreases, then decreasesincreases
As cellular respiration is a process that involves chemical reactions transforming oxygen, nutrients, and other molecules into ATP and waste products, if it happened in an insulated environment, the mass (or weight) wouldn't change, because it just converts a molecule into another and these molecules don't leave the space.
Provide brief overview of the endocrine system , explaining briefly how is exerts and effect on its target sells.
The endocrine system and made by a serie of glands and tissues that make and secrete hormones used to regulate the body functions and maintain the homeostasis. The homones produce by the endocrine system control several processes in the body, such as: metabolism, sexual function and reproduction, development and growth, sleep pattern, mood and emotions pattern, and blood pressure. The glands of that system sends the hormones produced into the bloodstream to the traget cells, like the case of the insulin that is produced in the pancreas and liberated by that organ into the blood to guide the glucose to the liver to be stored as glycogen, or the case of the strogen and testosterone that are essetial to the development of the secondary sexual traits in humans.
Leaving areas of natural growth at the edges of pastures and fields helps the farmer by protecting his or her fields from:conservationpollutionerosionanimals
Leaving areas of natural growth at the edges of pastures help farmers by protecting it's field from erosion.
This is because when natural vegetation is replaced by agricultural fields the soil is exposed and it stars to deteriorate, it also dries.
As a result microorganisms that once helped keep the soil fertile decrease and then nutrients also decrease.
When farmers leave stretches of native vegetation around the field this help reduce the nutrients runoff improving the availavility of nutrients.
Another advantage of this method is that it helps conservate the biodiversity. This is because the field borders provide food and cover for wildlife.
Ultrasound waves can cause algae cells to sink to the bottom of a body of water. Scientists apply ultrasound waves to a lake suffering from eutrophication. Which outcome should the scientistsexpect to observe in the lake
The correct option is the last one "lower concentration of nutrients". Algae might use the excess of nutrients in the lake, which ultimately could lead to increase oxygenation in water and less concentration of nutrients, as the algae is using them to perform photosynthesis.
Collenchyma cells and how they function
Answer: It provides support, structure, mechanical strength, and flexibility to the petiole, leaf veins, and stem of young plants, allowing for easy bending without breakage.
Explanation: Collenchyma cells are elongated cells with irregularly thick cell walls that provide support and structure. Their thick cell walls are composed of the compounds cellulose and pectin. These cells are often found under the epidermis, or the outer layer of cells in young stems and in leaf veins.
Lipids and proteins are both important molecules found in living things
Question:
Solution:
Both lipids and proteins are macromolecules. This means that they are made of monomers. Condensation reactions result in covalently bonded monomers. In fact, monomers are covalently linked to generating these macromolecules.
The term lipid refers to a wide variety of biomolecules including fats, oils, waxes, and steroid hormones. Regardless of their structure, location, or function in a cell or body, all lipids share common characteristics that allow them to group together.
Now, lipids differ in structure from proteins in the following way:
The monomers of proteins are amino acids and the monomers of lipids are fatty acids and glycerol.
Which of the following is/are not a condition affecting the Hardy-Weinberg equilibrium?a. Recessive traitsb. Genetic driftc. Mutationd. Natural selection
The answer is the letter a. Recessive traits- do not affect the Hardy-Weinberg equilibrium.
*Genetic drift, mutation, and natural selection are mechanisms that affect the allele frequencies in a population. If these events do occur, it alters the balance of the population's allele frequencies.
*The principle of Hardy-Weinberg equilibrium is that the genetic variation in a population will remain constant from one generation to the next. It is important that there is no presence of disturbing factors (for example natural selection, genetic drift, and mutation).
Answer:
reccesive traits
Explanation:
The five conditions impacting the Hardy-Weinberg equilibrium are mutations, natural selection, genetic drift, migration, and nonrandom mating. Recessive traits don't cause a direct change to the Hardy-Weinberg equilibrium without action of the five conditions.
PF
What is an autoimmune disease?a disease that occurs when the body is allergic to food that is eatena disease that occurs when a person overworks their bodya disease that occurs when a person is allergic to others' toucha disease that occurs because the body has an immune response against its own cells or tissues
An autoimmune disease happens when a person's immune response cannot distinguish the difference between the self and the foreign bodies.
ANSWER: a disease that occurs because the body has an immune response against its own cells or tissues
6. The overall reaction for cellular respiration is: C6H12O6 + 602 --> 6C02 + 6H20Describe why CO2 forms and identify the stages/steps of aerobic respiration that produce each CO2.
CO2 forms as glucose oxidates (loose protons). In the process releases large amounts of energy which is used to form ATP.
The glucose molecule undergoes glycolysis and breaks into two molecules of pyruvate.
The Pyruvate enters the mitochondria, forms acetyl CoA and by loosing one carbon in the form of CO2. Then starts the Krebs cycle. At the end of the cycle 2 molecules of CO2 are formed for each Pyruvate molecule.
2CO2 (one from each pyruvate) to form acetyl CoA.
4CO2 (two from each pyruvate) in the krebs cycle.
You are studying enzyme activity in the body and run an experiment. You want to see how pH affects the enzyme Amylase's efficiency at breaking down carbohydrates into Maltose. Look at the data table your assistant has compiled and determine what the optimal pH level is for Amylase. A. 3 B. 12 C. 7 D. 4
Introduction to Biology: Enzymes, enzyme function.
Enzymes are biomolecules that act as catalysts and accelerate chemical reactions. Most enzymes are proteins, and there are also some RNA molecules that act as enzymes.
All enzymes have an optimal temperature and pH at which the reaction has it maximun reaction rate, outside these parameters, the enzyme is less efficient and it can even loss it shape (denaturalization).
In this case, the optimal pH would be the one at which the time needed to produce 10 grames of maltose is the lowest. If we look at the table, the lowest times are 20 and 21 seconds, at a pH of 6 and 8 respectively, so the optimal pH is between 6 and 8.
This means the correct answer would be C. 7
What’s the difference between meiosis 1 and 2?
Meiosis is a cellular division that produces four haploid daughter cells from a parent cell. It is observed in gametes/sex cells. The process of meiosis undergoes two consecutive divisions. Each division has five phases: prophase, metaphase, anaphase, telophase, and cytokinesis.
In Meiosis I, the chromosomes of the parent cells are multiplied. Each chromatid of the chromosomes exchanges genetic information, or recombination. The number of chromosomes at the end of Meiosis I is haploid but the chromatids of the chromosomes are still attached to each other. Due to recombination, the sister chromatids may not be identical to each other.
In Meiosis II, the chromosomes are separated and produce four daughter cells. It is shorter compared to Meiosis I because it no longer replicates the DNA or exchanges genetic information, and just separates the prepared chromatids from Meiosis I. It is similar to mitosis since it begins with a haploid cell and ends with a haploid cell.
Growth limits result from such factors as the availability of living and nonliving resources, and from such challenges such as: _____(check all that apply) Group of answer choicescompetitiondiseasepredationsymbiosis
The answers are:
COMPETITION
DISEASE
PREDATION
Symbiosis- refers to the relationship of two dissimilar species which depends on whether either or both organisms benefit from the relationship.
True of false:Natural selection operations on information that is in the genes, yet it can also produce new information.
Natural selection operates increasing the allele frequency of the traits that bring more benefits for surviving and reproducing to the individuals that have them. But it is not a mechanism that produces new variants such us mutation.
Answer: False
In which phase of photosynthesis is oxygen released
Photosynthesis is divided into 2 phases: light phase or light-dependent and dark phase or light-independent.
The light phase is so called because the energy of the photons of sunlight is captured in this phase. This energy is transferred to the electrons of the plant which are previously provided by water molecules.
When water gives up its electrons in the thylakoid, H+ is released for energy production, and O2 molecules are released through the stomata during the light phase.
Interpret this line graphshowing the changes in thenumber of foxes and miceover the decades and explainyour interpretation of thedata represented in thegraph. In your explanation,describe the cyclical patternsshown and possible causes ofthese changes.
The oscillation is a natural consequence of the predator-prey relationship between the mice and foxes. A qualitative interpretation could be:
If the mouse population is high, then the population of foxes will increase because foxes eat mice. But as the population of foxes rises, the population of mice begins to decrease, since they are being preyed by foxes. Then, while population of mices declines, that of foxes do the same, because there are fewer mice to eat. Finally, with a low fox population, mice population can rise again, repeating the cycle.
These dynamics are capture by the Lotka-Volterra equations for predator-prey relationship.
Match the PRODUCTS to the correct process: PHOTOSYNTHESIS or CELLULAR RESPIRATION..CO2H2OGlucoseO2ATP
Product is a substance formed as a result of a reaction. In photosynthesis, the products are glucose and oxygen. In cellular respiration, the products are carbon dioxide and water, as well as ATP. Therefore, the correct answer is:
CO2 - Cellular respiration
H2O - Cellular respiration
Glucose - Photosynthesis
O2 - Photosynthesis
ATP - Cellular respiration