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Apologia Biology Module 11 Edition 2
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Invertebrates
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Animals that lack a backbone
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Terms in this set (31)
Invertebrates
Animals that lack a backbone
Vertebrates
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
Epidermis
an outer layer of cells designed to provide protection
Mesenchyme
the jellylike substance that separates the epidermis from the inner cells in a sponge
Collar Cells
flagellated cells that push water through a sponge
Amoebocytes
cells that move using pseudopods and perform different functions in different animals
Gemmule
a cluster of cells encased in a hard, spicule-reinforced shell
Polyp
the sessile, tubular form of a cnidarian with a mouth and tentacles at one end and a basal disk at the other
Medusa
a free-swimming cnidarian with a bell-shaped body and tentacles
Epithelium
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
Mesoglea
the jellylike substance that separates the epithelial cells in a cnidarian
Nematocysts
small capsules that contain a toxin which is injected into prey or predators