Q: Fact 1: Humans have collected and grown mushrooms for food for thousands of years. Fact 2: Yeast and mushrooms are types of fungus. Given the two facts above, what have humans collected and grown for thousands of years?

OPT:
1). Organic compounds.
2). types of coral.
3). types of ferns.
4). bioaerosols.
5). Most plants.
6). types of fungus.
7). types of pine trees.
8). peachleaf willow.
A:
6).