Acoelomates are Characterized By

Question

Acoelomates are characterized by
A) the absence of a brain.
B) the absence of mesoderm.
C) deuterostome development.
D) a coelom that is not completely lined with mesoderm.
E) a solid body without a cavity surrounding internal organs.

Accepted Answer

Acoelomates are organisms that lack a coelom, which is a body cavity surrounded by mesoderm. As a result, they have a solid body without a cavity surrounding internal organs. They may have a primitive nervous system, but they do not have a well-defined brain. They undergo protostome development, which means that the mouth develops first from the blastopore during embryonic development.