I believe the answer is B. Homoiothermal
Explanation:
this is cheeeeeeeeeeemistry
The main form is carbon dioxide and methane
In the small intestine, these cells contain microvilli, which are tiny hair-like projections that increase nutrient absorption. These projections increase the surface area of the small intestine allowing more area for nutrients to be absorbed.
Gathering and preparing for a scarcely adapt winter