The most ancient branch point in animal phylogeny is the characteristic of having ________.
A) radial or bilateral symmetry
B) diploblastic or triploblastic embryos
C) true tissues or no tissues
D) a body cavity or no body cavity

Question

Quizplus · Accepted Answer

The most ancient branch point in animal phylogeny is the characteristic of having true tissues or no tissues. This is the difference between sponges (no tissues) and all other animals (true tissues). Radial or bilateral symmetry, diploblastic or triploblastic embryos, and a body cavity or no body cavity evolved later in animal evolution.

The Most Ancient Branch Point in Animal Phylogeny Is the Characteristic