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20 terms

animal characteristics

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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