What happens to a population when the death rate decreases? A. The birthrate usually increases.
B. The population size usually increases.
C. The population size usually decreases.
D. The birthrate usually decreases.

B. The population size usually increases.

Explanation:

You can predict the growth rate by using this simple equation: growth rate = birth rate – death rate.

If the birth rate is larger than the death rate, then the population grows.

The population size will decrease.

If the birth and death rates are equal, then the population size will not change.

the answer is "a.) well–developed vascular system."

explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands