Answer: C
Explanation: The process that occurred in the lake is natural selection. In the presence of an external environmental influence such as pollution, only the trouts that were fit to survive or in other words those that have the alleles that help in adapting to the new conditions live and increased in numbers. In such a case, one can say the fittest of the organisms survived and the corresponding allelic frequency in that population increased over time. The organisms carrying the other alleles died due to pollution and hence the overall frequency of alleles change.
No, a macromolecule is a large organic molecule
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Correct answer: D) From bacteria living in their roots
Nitrogen is an essential plant nutrients, but it is metabolically unavailable to higher plants and animals. It is available to some species of microorganism by biological nitrogen fixation in which nitrogen is converted to ammonia with the help of enzyme dinitrogenase.
The process of breaking apart the two atoms in a nitrogen molecule is called nitrogen fixation. Plant obtain the nitrogen they need from the soil which is already fixed by the bacteria and archae.
Example: <em>Azobacter</em><em>,</em> Nostac
<span>Answer: c. release 50-80% of their water back into the ecosystem
Rainforest has a high rate of rain, which gives the plant abundant amount of water. There is no need for the plant to conserve and retain water. it doesn't need the ability to adapt to drought either.
Rainforest has a high precipitation because of the transpiration.
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Explanation:
plant cells have cell membrane and cell wall while animal cells only have the cell membrane missing the cell wall
