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

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

answer; i believe the answer is (polygenic inheritance;