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19 Cards in this Set
- Front
- Back
Compare and contrast radial and bilateral symmetry in animals. Give an example of each type.
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radial symmetry- can be divided along any plane into equal halves; hydra; bilateral symmetry- can be divided only along one plane to form two equal halves; flatworm
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Distinguish between the body plan of an acoelomate and a coelomate. Give an example of an animal with each type of body plan.
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Acoelomates, such as flatworms, have three cell layers with a digestive tract but no body cavity. Coelomates, such as earthworms, have a coelom in which internal organs are suspended.
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Explain how an adaptation such as an exoskeleton could be an advantage to animals in land biomes.
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An exoskeleton prevents water loss from body organs and supports an animal’s body on land.
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Compare movement in acoelomate and coelomate animals.
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Acoelomates have no body cavity, whereas coelomates can brace their muscles against the coelom, giving them more powerful movements.
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Explain the relationship between having a coelom and the development of complex organ systems.
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The coelom provides space for specialized organs and organ systems.
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a term that describes the arrangement of body structures.
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symmetry
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an animal's body plan that can be divided along any plane, through a central axis, into roughly equal halves
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radial symmetry
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animals with a body plan that can be divided down its length into two similar right and left halves that form mirror images of each other.
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bilateral symmetry
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head end of bilateral animals where sensory organs are often located.
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anterior
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tail end of bilaterally symmetric animals.
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posterior
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upper surface of bilaterally symmetric animals
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dorsal
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lower surface of bilaterally symmetric animals
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ventral
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an animal with no body cavities (flatworm)
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acoelomate
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fluid-filled body cavity partly lined with mesoderm.
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pseudocoelom
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fluid-filled body cavity completely surrounded by mesoderm.
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coelom
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hard covering on the outside of some animals, including spiders and mollusks; provides a framework for support, protects soft body tissues, and provides a place for muscle attachment.
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exoskeleton
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animal that does not have a backbone
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invertebrate
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internal skeleton; provides support, protects internal organs, and acts as an internal brace for muscles to pull against.
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endoskeleton
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an animal with an endoskeleton and a backbone
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vertebrate
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