Which body system responds to an excess of water by stimulating the kidneys to remove more of it?
a. muscular system
b. nervous system
c. digestive system
d. endocrine system

In what layer of the sun is energy transfers between atoms

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Why does competiton happen? a: different organisms have different needsb: there are limited resources in an ecosystemc: there are no predators in an ecosystemd: organisms do not need the same resources (i think it's b but i'm not sure)