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Fauna
Ovum
Germ layer
Sponge
Chordate
Protist
Protozoa
Embryo
Vertebrate
Blastula
Sea anemone
Annelid
Endoderm
Cambrian explosion
Cnidaria
Mollusca
Echinoderm
Mesoderm
Cell wall
Drosophila melanogaster
Extinction
Sea urchin
Precambrian
Animalia
Caenorhabditis elegans
Dye
Coral
Reptile
Earthworm
Heterotroph
Key terms:
animals
phyla
sponges
animalia
worms
prey
deuterostomes
bilateria
digestive
parasitic
tissues
protostomes
blastula
superphylum
motile
undergo
lophotrochozoa
sunlight
porifera
ecdysozoa
microscopic
body cavity
most animals
carolus linnaeus
annelida
sugars
heterotroph
trace fossils
animal phyla
animal phylum
germ layers
dier
endoderm
coelom
million years ago
chordata
all animals
eukaryotic
digestive chamber
originally considered
fossil record
cambrian
multicellular
mollusca
protist
radially symmetric
unranked
fungi
photosynthesis
ctenophora
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