Question

Briefly describe skeletal system in Sponges.

Answer 1

Explanation:

Sponge skeletons are made up of hard, rod-like projections called spicules and a protein called collagen. ... Skeletal elements made of spongin are often referred to as spongin fibers because they are more flexible than calcium or silica spicules. Spongin is a protein and it is secreted by cells called spongocytes.

Answer 2

Answer:

Sponge skeletons are made up of hard, rod-like projections called spicules and a protein called collagen. Skeletal elements made of spongin are often referred to as spongin fibers because they are more flexible than calcium or silica spicules. Spongin is a protein and it is secreted by cells called spongocytes.