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Apologia Biology Module 11 Edition 2

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Invertebrates

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Terms in this set (31)

Animals that lack a backbone

Animals that possess a backbone

Spherical Symmertry

An organism posseses spherical symmetry if it can be cut into two identical halves by any cut that runs through the organism's center

Radial Symmetry

An organism posseses radial symmetry if it can be cut into two identical halves by any langitudinal cut through its center

Bilateral Symmertry

An organism possesses bilateral symmetry if it can only be cut into two identical halves by a single longitudinal cut along its center which divides it into right and left halves

an outer layer of cells designed to provide protection

the jellylike substance that separates the epidermis from the inner cells in a sponge

flagellated cells that push water through a sponge

cells that move using pseudopods and perform different functions in different animals

a cluster of cells encased in a hard, spicule-reinforced shell

the sessile, tubular form of a cnidarian with a mouth and tentacles at one end and a basal disk at the other

a free-swimming cnidarian with a bell-shaped body and tentacles

animal tissue consisting of one or more layers of cells that have only one free surface, because the other surface adheres to a membrane or other substance

the jellylike substance that separates the epithelial cells in a cnidarian

small capsules that contain a toxin which is injected into prey or predators