Which type of sponge material supports a sponge’s body structure? a. spongin b. choanocyte c. spicule d. both a and c

both a n c

spongin is a collagen protein which forms the fibrous "skeleton" of a sponge and gives sponges some flexibility.. Spicules help keep the sponge rigid as well as make it unpalatable to predators

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation:

voluntary muscles are controlled by the cerebellum.