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

The ____ of an earthworm allows them to resist desiccation in terrestrial environments.

Members of the phylum ____ are the simplest organisms with a separate mouth and anus.

Figure 31-3 Refer to the accompanying figure. The structures labeled as 1 are used for:

What generation do spores belong to?

Ectothermic animals:

Which term best explains why collagen fibers are abundant in tendons?

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

All functions of Mr. Andrews brain have stopped. This is an example of ___________________.  

In Mexico’s Days of the Dead, on November 1, All Saints’ Day, the spirits of the dead children (angelitos) arrive promptly at 4:00 a.m.  This prompt arrivel of the angelitos or expected behavior represents a ________.