100 answer
which of the following describes how the circulatory and excretory systems work together to maintain homeostasis?

a. by delivering oxygen to cells
b. by having cells that fight infections
c. by delivering nutrients from food to cells
d. by carrying waste to the kidneys

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

Spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Ais a group of individuals of the same that exist together in the same place at the same time