7. What is the benefit of having a variety of pollinating birds and insects, and how could this service be harmed by changes in their population?

i think it is dna, i'm not totally sure but i think it might be.

not sure if this what   you'r looking for would be percent composition

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.