Both smooth muscle fibers and cardiac muscle fibers:

Within the chordate classes, the unique characteristic of the class Aves is:

What term describes how most sponges can produce both male and female gametes?

A ____ plane divides the animal body into dorsal and ventral parts.

From an evolutionary perspective, true nerve cells are first seen in the phylum:

The heart of amphibians has ____ chambers. The hearts of birds and mammals have ____ chambers.

Deuterostomes are characterized by ____ and ____ cleavage.

Which one of the following is a unique characteristic of angiosperms EXCEPT?

All echinoderms are found:

Which statement about bilateral symmetry is FALSE?