Some populations of Atlantic tomcod fish have an allele that makes the fish resistant to toxic pollutants called PCBs. Tomcod populations in several rivers were analyzed for the presence of this allele. Each river had varying levels of PCB pollution. Which of the following results would best support the conclusion that natural selection is influencing the presence of this allele in the tomcod populations?
A. All of the tomcod in each of the rivers have this allele.
B. The percentage of tomcod with this allele remains the same from year to year in each river.
C. The rivers with high PCB levels have larger percentages of tomcod with this allele than the rivers without PCBs.
D. Eggs from tomcod without this allele can hatch in rivers with or without PCBs, and eggs from tomcod with this allele can only hatch in rivers without PCBs.
Answer:
D
Explanation:
Hope it helps#CARRYONLEARNINGEggs from tomcod without this allele can hatch in rivers with or without PCBs, and eggs from tomcod with this allele can only hatch in rivers without PCBs.
What is Tomcod populations?A benthopelagic piscivore, the Atlantic Tomcod is also known as frostfish or tommy cod. Although large ones are allegedly caught less frequently than they once were in estuary rivers, it is still abundant around the seacoast.
Although anadromous, Atlantic tomcod do not migrate very far between fresh and salt water. In shallow brackish or fresh water, sand and gravelly bottoms are where eggs are laid. Masses of eggs sink to the bottom.
Within 24 hours of hatching, newly hatched larvae swim to the surface to breathe surface air before their pneumatic duct closes. Young-of-the-year may spend their first spring and summer in fresh or barely brackish water, but they eventually move into estuaries and nearshore waters.
Therefore, Eggs from tomcod without this allele can hatch in rivers with or without PCBs, and eggs from tomcod with this allele can only hatch in rivers without PCBs.
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Jackie bought a large concrete flower container for her yard. The salesperson recommended that Jackie add a waterproof liner or sealer/paint before she uses it. Why would that be a good recommendation?
Answer:
To preserve the longevity of the pot.
The picture below appears to be a ___ ?
A. Community
B. Predator
C. Biome
D. Population
E. Individual
Answer:
i guess a. community
hope it helped u
Madison is looking at a cell under the microscope. The organism has only one cell, and it has a nucleus and membrane bound organelles. It has no cell wall and uses flagella for movement. In which kingdom should this organism be classified?
Answer:
Protista. hope this helps!!! (my answer might be wrong)
Which is a chemical property?
A. Mass
B.flammability
Answer:B flammability
Explanation:
Its a chemical change because the chemicals in the substance change when being lit on fire (example burning wood)
what are the general characteristics of flowering plants?
ill give brainiest
Answer:
Angiosperms have small pollen grains that spread genetic information from flower to flower. These grains are much smaller than the gametophytes, or reproductive cells, used by non-flowering plants. This small size allows the process of fertilization to occur quicker in the flowers of angiosperms and makes them more efficient at reproducing
Explanation:
Jack found a fossil in a rock that he dug up. The fossil is of a fish.
Which can the fossil tell him about the land when the fish was alive?
Jack found a fossil in a rock that he dug up. The fossil is of a fish. That there was water there once. A fossil record provides the proof of the typical progenitor and its many species.
What are the fossils?Fossils are the preserved remains of flora and faunna whose bodies were seeded in sediments, such as sand and mud, under ancient seas, lakes and rivers.
Fossils also include any preserved trace of life that is usually more than 10 000 years old.
Thus, The fossil is of a fish. That there was water there once.
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Which elements are essential for living organisms to survive? Check all that apply.
carbon
polonium
sulfur
zinc
hydrogen
oxygen
nitrogen
Answer:
it's carbon, sulfur, hydrogen, oxygen, and nitrogen (A, C, E, F, G)
Explanation:
The most essential elements for the survival of living organisms are carbon, hydrogen, oxygen, and nitrogen.
Why oxygen is an important element?Oxygen is important for respiration and the energy-producing process that drives most living things' metabolisms. This is considered an element that is important for the life.
All life forms on Earth require carbon. Carbon intake and outflow are a feature of every plant and animal life, whether they take in carbon to help build food or release carbon through respiration.
Therefore, Oxygen, carbon, hydrogen, and nitrogen are important elements as 96% of the human body will be made with them.
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Cells are considered cancerous when
X + H20 → Y + O2(what would be y in this equation ?)
Answer:
y. 2. • CxHy + O2 → x CO2 + y/2 H2O. Combustion Problem. Erythrose is an important mono-saccharide that is used in chemical synthesis. It contains Carbon.
Explanation:
In the chemical equation X + H₂O → Y + O₂, Y represents the product of the chemical reaction, here Y is the glucose, and this X is carbon dioxide, and this is a reaction of the photosynthesis.
What is photosynthesis?During photosynthesis, the energy from light is used to split water molecules into oxygen and hydrogen ions. The oxygen is released into the atmosphere as a waste product, while the hydrogen ions are used to create a chemical gradient across the thylakoid membrane within the chloroplast. This gradient is then used to power the creation of ATP, the energy currency of cells, as well as to reduce carbon dioxide to form organic molecules, such as glucose. The overall equation for photosynthesis is:
6 CO₂ + 6 H₂O + light energy → C₆H₁₂O₆ + 6 O₂
Hence, In the chemical equation X + H₂O → Y + O₂, Y represents the product of the chemical reaction; here, Y is the glucose.
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Are data that do not support a hypothesis useful?
A. Yes, because the data prove that the experiment was designed
poorly
B. Yes, because the data provide useful information that can lead to
more testing
C. No, because the data show that the experiment failed
D. No, because the data must be inaccurate
Anyone know? I keep getting it wrong.
The Answer Is C
have an amazing day <3
Which of the following is transcribed into a protein?
Answer:
DNA mRNA Amino Acids Polypeptide chains Proteins
Explanation:
A farmer’s profit is determined by the amount by which the sale value of the ___ ___ exceeds the cost of production and distribution.
Answer:
profits farmer
Answer:
Crop yield
Explanation:
Select the correct answer.
In January, Earth is closest to the Sun in its orbit. Yet the Northern Hemisphere experiences winter. Which statement explains this phenomenon?
A.
Earth completes one precession cycle in January every year.
B.
The Northern Hemisphere is located at high latitudes.
C.
The Northern Hemisphere is tilted away from the Sun.
D.
The eccentricity of Earth’s orbit is high in January.
E.
The obliquity or tilt of Earth is greater than 23.5° in January.
Answer:
C. The Northern Hemisphere is tilted away from the sun
In January, Earth is closest to the Sun in its orbit, yet the Northern Hemisphere experiences winter because the Northern Hemisphere is tilted away from the Sun; this is option C.
What is Earth's axis tilt?The Earth's axis is tilted at an angle of approximately 23.5 degrees relative to the plane of its orbit around the Sun. This tilt is the primary reason for the seasons on Earth. As the Earth orbits around the Sun, the orientation of its axis relative to the Sun changes, resulting in different parts of the planet receiving varying amounts of sunlight throughout the year. When the Northern Hemisphere is tilted away from the Sun, as it is in January, the Sun's rays hit the Earth at a lower angle, resulting in less direct and less intense heat and light. This means that the Northern Hemisphere receives less sunlight and experiences colder temperatures, resulting in winter.
Hence, in January, Earth is closest to the Sun in its orbit, yet the Northern Hemisphere experiences winter because the Northern Hemisphere is tilted away from the Sun, which is option C.
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Write an argument for describing the human body as a system.
Answer:
Our bodies consist of a number of biological systems that carry out specific functions necessary for everyday living. The job of the circulatory system is to move blood, nutrients, oxygen, carbon dioxide, and hormones, around the body. It consists of the heart, blood, blood vessels,arteries and veins.
Explanation:
Galaxy #7 To which category does galaxy #7 belong? Why does it belong in this category?
Answer:
Elliptical galaxy category
Explanation:
An elliptical galaxy doesn't have spiral "arms" and has a smooth light that slowly decreases as it stretches out from the center. This means that the center is the brightest and as it goes out in different directions, the brightness decreases.
Hope this helps!
¿Cuántos electrones no apareados hay en un átomo de estaño?
a.3
b.2
c.0
d.1
Answer:
B
Explanation:
The main function of leaves is to give beauty to the plant . True or false
Answer:
no,
Explanation:
The main function of a leaf is to produce food for the plant by photosynthesis
Answer:
the answer is false
The state of Illinois has a law that requires 25% of electricity in the state 2 be produced by renewable energy sources by the year 2025. This law is an example of
a. Green pricing
b. A renewable portfolio
c. An Energy Star promotional program
Answer:
b. A renewable portfolio
Explanation:
A renewable portfolio refers to the policies that are designed to increase the use of renewable energy sources for electricity generation. These renewable energy sources such as water, wind and solar radiation etc are used for the generation of electricity and also to reduce pollution in the environment. These renewable energy sources are present unlimited or in huge amount in our environment so its usage is beneficial for both humans and environment.
Why does the concentration of CO2 go up and down throughout the year?
the role of plants in carbon cycle
Explanation:
the amount of CO2 found in the atmosphere varies over the course of a year. much of this variation happens because of the role of plants in carbon cycle...respiration occurs all the time, but domains during the colder months of the year, resulting in higher CO2 levels in the atmosphere during those months.
Why does the Sun generally appear to rise in the east, move across the sky, and
set in the west each day? *
O (1) Earth rotates on its axis.
(2) Earth revolves around the Sun.
(3) The Sun rotates on its axis.
(4) The Sun revolves around Earth.
Help please!?!?!??!?!?????
Answer: A
Explanation: Hope this help :D
An allele arises in a population that helps individuals digest cellulose. While the allele starts in only one organism, it increases in allele frequency because it allows organisms that carry it to reproduce more. What is this an example of
ANSWER: A NATURAL SELECTION.
EXPLANATION:
When allele has direct effects on the organism and the environment, it is termed natural selection. It either affects an organism positively by causing more DNA reproduction, leading to the increase in allele’s frequency, or negatively by decreasing it .
However, this shouldn't be mistakened for genetic drift, where allele increase or decrease is established in the random organisms that survived.
which can lower soil
Industries that release certain air pollutants cause
pH.
A. ammonia contamination
B. acid rain
O c. salt buildup
D. runoff
its acid rain jus took the quiz
Answer:
Acid rain
Explanation:
Pollutants released in the air contaminate the clouds and they make acid rain instead of regular rain
The nucleus contains______
Answer:
If you're talking about the cell: The nucleus contains the cell's chromosones
If you're talking about the atom: The nucleus contains protons and neutrons.
Explanation:
Have a good day :)
what two element where found in the sun
Answer:
Hydrogen and Helium
Explanation:
The sun is composed of layers made up almost entirely of hydrogen and helium. These gases carry out different functions in each layer, and the sun's layers are measured by their percentage of the sun's total radius.
Answer:
Hydrogen and Helium!!
Explanation:
lol
Which type of relationship do cactus wrens and cholla cacti
demonstrate?
Answer:
commensalism If that is what your looking for lol
Explanation:
Which central idea of the article is MOST
supported by this paragraph?
А
African crested rats use poison from tree bark
as a type of defense.
B
African crested rats have many natural
predators in their woodlands habitat.
Scientists
want to increase conservation efforts
to protect crested rats.
D
Scientists are just beginning to leam about the
behaviors of crested rats
what type of cloning is considered an ethical concern
Explanation:
Therapeutic cloning raises several different but related ethical issues. These include the appropriateness of creating embryos with the intention of destroying them, of hastening the day when reproductive cloning might become feasible, and of fostering a market in human oocytes for research purposes.