The answer is B. Oxygen
To do aerobic respiration, oxygen is needed. Without oxygen, the body won't produce some substance which will be needed to do Krebs cycle and electron transport. Most of the energy will be produced by the electron transport so without oxygen the amount of energy produced will be much less.
When the body becomes dehydrated, a chemical signal is sent that causes nephrons in the kidneys to absorb more water and excrete more salts. This is an example of a <em>D Feedback loop</em>.
Answer:
Through the air going into the mouth or nose, through sweat pores, and though food going into the mouth.
Answer: he crystallized tobacco mosaic virus ( TMV)
Explanation