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30 Cards in this Set

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