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Invert Key Terms

termdefinition
invertebrate animals that lack a vertebral column
incomplete digestive system a digestive cavity with one opening
complete digestive system a digestive tract with two openings
larva a juvenile or immature stage of an animal
fission asexual reproduction where an animal divides into two parts
ectoderm outer cell layer that tissues develop from
endoderm inner cell layer that tissues develop from
cephalization the concentration of nerve tissues at one end of the body, forming a head
mesoderm the third layer of cells between the ectoderm and the endoderm
pseudocoelom a partial body cavity that is filled with fluid
hydrostatic skeleton the internal support provided by the pressure of the fluid in the coelom
coelom a fluid-filled cavity completely enclosed by mesoderm
segmentation the division of the body into multiple parts
notocord a rigid rod that runs down the entire body
Created by: njgirl1000
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