The vase-like body of a simple sponge is likely to contain all of the following materials or layers except
A)a digestive cavity lined with enzyme-secreting cells.
B)mesophyl,a protein-rich matrix.
C)a somewhat contractile outer epithelium.
D)specialized collar cells or choanocytes.
E)spicules or a spongin skeleton,or both.

Question

Quizplus · Accepted Answer

Simple sponges lack a digestive cavity lined with enzyme-secreting cells. Instead, food particles are engulfed by cells in the mesohyl or are taken up by choanocytes and digested intracellularly.

The Vase-Like Body of a Simple Sponge Is Likely to Contain