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25 Cards in this Set
- Front
- Back
hollow ball of cells that gives rise to all the tissues and organs of an adult body
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blastula
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in animals, the outer layer of embryonic tissue from which the skin and nervous system develop
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Ectoderm
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inner layer of embryonic tissue from which the digestive organs develop in animals
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Endoderm
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middle layer of embryonic tissue in animals from which the skeleton and muscles develop
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Mesoderm
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an animal's shape, symmetry, and internal organization
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Body Plan
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irregular in shape
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asymmetrical
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arrangement of body parts around a central axis
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radial symmetry
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arrangement of body parts so there are distinct left and right halves that mirror each other
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Bilateral symmetry
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in bilaterally symmetric animals, the development of a head end with a concentration of nerves and sensory structures
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Cephalization
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fluid-filled body cavity that forms between the body wall and the digestive tract
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coelom
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an animal that lacks a coelom, or body cavity
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acoelomate
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animal with a body cavity located between the endoderm and the mesoderm
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pseudocoelomate
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animal with a body cavity located entirely within the medsoderm
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coelomate
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branching diagram that shows how animals are related through evolution
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Phylogenetic tree
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a digestive ca vity with only one opening; found in simple animals
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Gastrovascular cavity
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simultaneous uptake of oxygen and release of carbon dioxide, by the lungs, gills, or through the skin
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Respiration
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extremely thin projection of tissue rich in blood vessels that is the site of gas exchange in aquatic and a few terrestrial animals
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Gill
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system in which blood leaves the blood vessels and bathes the body's tissues
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Open circulatory system
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system in which the blood does not leave the blood vessels and materials diffuse across the walls of the vessels
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Closed circulatory system
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support structure that consists of water contained under pressure in a closed cavity
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Hydrostatic skeleton
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hard external covering of some invertebrates
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Exoskeleton
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an internal skeleton composed of a hard material, such as bone
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Endoskeleton
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organism with both testes and ovaries
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Hermaphrodite
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union of egg and sperm occuring outside the body or either parent
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External fertilization
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fertilization that occurs within the body of the femal parent
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Internal fertilization
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