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30 Cards in this Set
- Front
- Back
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an animal without a backbone
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invertebrate
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in sexual reproduction, the zygote undergoes a series of divisions to form a ___, a hollow ball of cells
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blastula
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an animal whose mouth is formed from the blastopore
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protosome
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only a single imaginary plane can divide the body into two equal halves
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bilateral symmetry
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the concentration of sense organs and nerve cells at the front end of the body
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cephalization
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an immature stage of an organism that looks different from the adult form
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larva
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phylum in which sponges are placed
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Porfiera
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the simplest animals to have body symmetry and specialized tissues
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Cnidarians
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a stage in the cnidarian life cycle in which the mouth points upward
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polyp
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a digestive chamber with one opening
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gastrovascular
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the names of an animal's three germ layers
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endoderm, mesoderm, and ectoderm
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what is a body cavity?
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a fluid-filled space that lies between the digestive tract and the body wall
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what does the movement of water through a sponge provide for the sponge?
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it provides a simple mechanism for feeding, respiration, circulation, and excretion
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Which way does the mouth point in a medusa?
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to the bottom
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what structures do coral colonies produce?
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coral reefs
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soft-bodied invertebrate with an internal or external shell
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mollusk
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structure in mollusks that contains the internal organs
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visceral mass
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process of asexual reproduction in free-living flatworms
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fission
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marine annelid with appendages
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polychaetes
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fluid-filled body cavity lines with mesoderm tissue
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coelom
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annelid that sucks blood
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leech
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structure in mollusks made of calcium carbonate
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shell
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mollusk with tentacles
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cephalopods
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structure used for respiration in mollusks
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gill
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organism that has no coelom
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acoelomate
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groups of nerve cells that control the nervous system
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ganglia
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type of annelid that includes the earthworm
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ogliochaete
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single-shelled mollusk that moves using its muscular foot
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gastropod
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thin layer of tissue that covers most of a mollusk's body
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mantle
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body cavity only partially lined with mesoderm
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pseudocoelom
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