☁️Answer☁️
The answer is A. Its organism one because if it got its energy from a biotic source, there would be an arrow pointing towards it.
The word sponge is more appropriate to use than Underground river since an underground river can loose water while an aquifer cannot loose water, unless it is open-air and above ground. then the aquifer would slowly loose water due to evaporation from the sun.
Answer:
A. Populations were separated through geographical isolation.
Explanation:
The respiratory system regulates oxygen flow, and provides regulation for oxygen blood content. Circulatory system plays a roll in providing enough oxygenated blood to the body
D. an arctic fox is brown in summer and white in winter