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19 Cards in this Set

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Compare and contrast radial and bilateral symmetry in animals. Give an example of each type.
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
Distinguish between the body plan of an acoelomate and a coelomate. Give an example of an animal with each type of body plan.
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.
Explain how an adaptation such as an exoskeleton could be an advantage to animals in land biomes.
An exoskeleton prevents water loss from body organs and supports an animal’s body on land.
Compare movement in acoelomate and coelomate animals.
Acoelomates have no body cavity, whereas coelomates can brace their muscles against the coelom, giving them more powerful movements.
Explain the relationship between having a coelom and the development of complex organ systems.
The coelom provides space for specialized organs and organ systems.
a term that describes the arrangement of body structures.
symmetry
an animal's body plan that can be divided along any plane, through a central axis, into roughly equal halves
radial symmetry
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.
bilateral symmetry
head end of bilateral animals where sensory organs are often located.
anterior
tail end of bilaterally symmetric animals.
posterior
upper surface of bilaterally symmetric animals
dorsal
lower surface of bilaterally symmetric animals
ventral
an animal with no body cavities (flatworm)
acoelomate
fluid-filled body cavity partly lined with mesoderm.
pseudocoelom
fluid-filled body cavity completely surrounded by mesoderm.
coelom
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.
exoskeleton
animal that does not have a backbone
invertebrate
internal skeleton; provides support, protects internal organs, and acts as an internal brace for muscles to pull against.
endoskeleton
an animal with an endoskeleton and a backbone
vertebrate