Which of the following is not needed in a population in order for natural selection to act?

a.) superior strength or size

b.) genetic variation

c.)b overproduction

d.) a struggle for existence

Microorganisms aren’t all decomposers; in fact, many act as producers or primary consumers in an ecosystem. how do microorganisms that act as producers benefit the rest of an ecosystem in terms of energy transfer? what about microorganisms that act as primary consumers?

How can you approximate the number of calories required to keep you in energy balance?

Why are common names a problem for scientist?