Chapter 26

Small organisms move oxygen an carbon dioxide through their skin by the process of:

Animals that do not have backbones are:

Which are the simplest animals to have radial symmetry?

Many small aquatic animals rely on a respiratory system to transport oxygen and nutrients.

Genetic diversity in populations is maintained due to:

Many sponges protect themselves from predators by producing:

The body symmetry of a cnidarian is:

Cnidarians have a central mouth surrounded by numerous tentacles.

Unlike plant cells, animal cells do not have:

The nerve cells of cnidarians make up a(n):

An animal that has distinct left and right sides shows:

Which of the following best describes the feeding habits of sponges?

An animal is each of the following EXCEPT:

Coral bleaching is a serious ecological threat because it:

When an animal's environment changes, sexual reproduction increases a species' ability to:

All members of the animal kingdom are heterotrophs

Sponges benefit some marine animals by:

In a cnidarian, cells that sense gravity are:

In a protostome, the blastopore becomes a mouth

Cnidarians have two basic body types, a medusa and a:

Coral bleaching can be cause by industrial pollutants.

If a cell contains a nucleus and membrane-bound organelles, it is:

Motility in animals is sometimes restricted to:

Flagella are important to the essential functions within a sponge because flagella:

A characteristic of cnidarians is that they are:

Aquatic animals that strain floating plants and animals from the water they take in are:

Sponges reproduce sexually by a process called: