Many small aquatic animals rely on diffusion to transport oxygen, nutrients, and waste products among their cells.

All members of the animal kingdom are heterotrophs.

Worms and insects are both vertebrates.

Animals with bilateral symmetry have arms arranged circularly around a central point.

An organism that is radially symmetrical has equal right and left halves.

Many small aquatic organisms move oxygen and carbon dioxide through their skin by the process of

The fundamental characteristics that distinguish animals from plants are

A blastula is a stage in the development of an embryo that consists of

An animal is each of the following except

An animal that has distinct left and right sides shows

Only five percent of all animals have

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

Unlike plant cells, animal cells do not have

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

When an animals environment changes, sexual reproduction improves a species' ability to

Muscle tissue exerts force by becoming

A parasite is a type of

The upper, or backside of an organism is its

Which of the three cell layers in animal embryos gives rise to muscles and much of the circulatory, reproductive, and excretory systems?

Large animals have a(n) _____ system to move materials around their bodies

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