Describe the behavior of brown bats
Answer:
producers
Explanation:
producers are plant which are at the base of an ecosystem.
First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst. hope this helps :)
A is the answer to this problem
