Bilaterally symmetrical animals can be divided into two major groups that separated during the Cambrian.These two lineages differ fundamentally in their

Question

Quizplus · Accepted Answer

The two major groups of bilaterally symmetrical animals that separated during the Cambrian differ fundamentally in their early embryological development. One group, called the Protostomes, develops their mouth first, and the other group, called the Deuterostomes, develops their anus first. This developmental difference has significant implications for the organization and structure of the body plans of these animals. The other options, such as modes of reproduction, modes of obtaining and storing energy, and metabolism, vary between different groups within each lineage but are not defining features of the two major lineages.

Bilaterally Symmetrical Animals Can Be Divided into Two Major Groups