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Invertebrates
Animals that lack a backbone.
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Vertebrates
Animals that possess a backbone.
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Spherical symmetry
An organism possess shperical symmetry if it can be cut into two identical halfs by any cut that runs through the organisms center.
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Radial symmetry
An organism possess radial symmetry if it can be cut into two identical halfs by any longitudinal cut through it's center.
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Bilateral symmetry
An organism posses bilateral symmetry if it can only be cut into two identical halfs by a single longitudinal cut along it's center which divides it into right and left halfs.
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Epidermis
An outer layer of cells design to provide protection.
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Masenchyme
The jelly-like substance that separates the epidermis from the inner cells in a sponge.
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Collor cells
Flagellated cells that pump water into a sponge.
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Amebocytes
Cells in a sponge that perform digestion and transport functions.
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Gemmule
A cluster of cells incased in a hard spicule-reinfored shell.
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Polyp
A sessile tubular cnidarian with a mouth and tentacles at one end, and a basal disc at the other.
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Medusa
A free swimming cnidarian with a bell shaped body and tentacles
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Epithelium
Animal tissue consisting of one or more layers of cells that have only one free surface, because the other suface adheres to a membrane or other substance.
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Mesoglea
The jelly-like substance that separates the epithelial cells in a cnidarian.
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Nematocysts
Small capsules that contain a toxin that is injected into prey or preditors.
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Testes
The organ that produces sperm.
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Ovaries
The organ that produces eggs.
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Enterior end
The end of an animal that contains it's head.
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Posterior
The end of an animal that contains the tail.
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Circulatory system
A system designed to transport food and other necassary substances throughout a creatures body.
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Nurvous system
A system of sensitive cells that respond to stimuli such as sound, touch, and taste.
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Ganglia
Masses of nurve cell bodies.
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Hermaphroditic
Possessing both the male and the female reproductive organs.
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Regenoration
The ability to regrow a missing part of a body.
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Mantle
A sheath of tissue that incloses the vital organs of a mollusk, makes the mollucks cell, and preforms resporation.
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Shell
The tough, multilayered structure secreted by the mantle. It it usual used for protection, but sometimes for body support.
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Visceral hump
A hump that contains a mollusks heart, digestive, and excretory organs.
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Foot
A muscular organ that is used for locomotion and takes a veriaty of forms depending on the animal.
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Radula
An organ covered with teeth that mollusks use to scrape food into their mouths.
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Univalve
An organism with a single shell.
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Bivalve
An organism with two shells.
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