Circulatory and respiratory systems.
Answer:
population is the number of something and species is something like a human or animal
Explanation:
The answer would be, "A", "The animals have much less of an environmental footprint today than in past years". Due to human cultivating of mass amounts of animals.
The answer is C. This means
that adaptive radiation is occurring between the two different populations of the
same species of plant, even though they
live in the same environment/habitat. The radiation
could be due to behavioral isolation as
exhibited by the fact that both types of plants are being pollinated by different organisms