条件筛选
-
Silkworms are holometabolous insects. What do they mainly eat, and why do they spin silk?
China is the country of origin for silkworm rearing and the main source of silk raw material, holding an important place in human economic life and cultural history. When I was in primary school, my favorite thing was raising a few silkworm babies at home. So what food do silkworms mainly eat? Why do they spin silk? One