⑴ Mushrooms are not plants. As a species, they are categorized as the fungus.
Edible mushrooms are rich in nutrients and they vary in type and function.
Mushrooms also grow quickly: they do not expand by cell division.
Instead, they grow by cell enlargement. That is the reason why we use
“mushroom” as a verb to describe something that increases in large
quantity over a short period of time.(20分)