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Module 11: Invertebrates

Horizontales
The sessile, tubular form of a cnidarian with a mouth and tentacles at one end and a basal disk at the other
An organism possesses radial symmetry if it can be cut into two identical halves by any longitudinal cut through its center
An outer layer of cells designed to provide protection
A cluster of cells encased in a hard, spicule-reinforced shell
Cells that move using pseudopods and perform a variety of functions in animals
An organism possesses spherical symmetry if it can be cut into two identical halves by any cut that runs through the organism's cener
Animals that possess a backbone
A free-swimming cnidarian with a bell-shaped body and tentacles
The jellylike substance that separates the epidermis from the inner cells in a sponge
Verticales
Organs that produce eggs
Animals that lack a backbone
Organs that produce sperm
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.
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
Small capsules that contain a toxin which is injected into prey or predators
Flagellated cells that push water through a sponge
The jelly-like substance that separates the epithelial cells in a cnidarian