B Mucor belongs to heterotrophs and decomposer in the ecosystem, and B is correct;
C, Mucor silk has erect hyphae and creeping hyphae, and C is correct;
D, the white hairs growing on tofu are mainly upright hyphae of Mucor, and D is correct.
So choose: a.
1, the specific method of beating the meridians of the elderly at the starting point
Stand naturally with your feet shoulder width apart, knees slight