The answer is A, 'a mammal' because it goes with the copulative verb 'to be', i. e., 'is'.
Answer:
D
Explanation:
trees interact with other organisms by providing food, shelter, and nutrient cycling.
I would assume that it would be A
1. The separation of a substance into simpler substances or basic elements. 2. The process of decaying or rotting. Decomposition of dead organic matter is brought about by the activity of certain bacteria and fungi feeding on it.