animal characteristics

Created by mlmoody 

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20 terms

protostomes

organisms where the mouth develops from the first opening or blastopore

invertebrates

animals without backbones

tissues

cells are organized into this

deuterostomes

organisms where the anus develops from the first opening and the mouth develops later from another opening

zygote

fertilized egg

budding

offspring develops as a growth on the body of the parent

fragmentation

parent breaks into pieces and each piece can develop into an adult animal

regeneration

new organism can regrow from a lost body parti if the part contains enough genetic info

parthenogenesis

female animal produces eggs that develop without being fertilized

blastula

fluid-filled ball of cells

gastrula

two-cell-layer sac with an opening at one end

asymmetry

irregular shape with no balance in body structure

radial symmetry

can be divided along any plane, through a central axis, into roughly equal halves

bilateral symmetry

can be divided into mirror image halves only along one plane through the central axis

anterior

head end of an animal

posterior

tail end of an animal

dorsal

backside of an animal

ventral

underside of an animal

coelom

body cavity that has tissue formed from the mesoderm

acoelomates

do not have a coelom

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