Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: When a mountain stream flows onto flatter land and comes to a stop rapidly, what do the deposits form? Answer: alluvial fan
In arid regions, a mountain stream may flow onto flatter land. The stream comes to a stop rapidly. The deposits form an alluvial fan ( Figure below ).

Question: Name the process of removing wastes from the body. Answer: excretion
Excretion is the process of removing wastes from the body.

Question: What type of systemic response involves lymphocytes? Answer: immune
There are two different types of immune responses. Both types involve lymphocytes. However, one type of response involves B cells. The other type involves T cells.