.
Spring-early summer
Summer-early fall
Late winter-spring
Algae and various small organisms
Nothing
Fish
True
False
True
False
True
False
Brain and hollow spinal cord
Brain and spine
Spine and nerve endings
0
1
2
3
True
False
Reptilia
Chordata
Porifera
450 million years
100 million years
360 million years
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