Answer:
D. Endocrine, circulatory, nervous
Explanation:
all the other answers are components to different systems
They get the sun, food, and water they need and they will maintain a high organization they need to live.
Answer:
D or A I think it might be D but maybe A
Answer: the trichromatic theory of color vision
Explanation: The theory began when Thomas Young proposed that color vision results from the actions of three different receptors.
Answer:
cells are regulated by their oxygen uptake