A hemocoel is part of an open circulatory system. True or False?
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Q68: Sea stars (starfish)are bilaterally symmetrical at one
Q69: Sponges are radially symmetrical. True or False?
Q70: A closed circulatory system is characteristic of:
A)flatworms.
B)annelids.
C)cnidarians.
D)sponges.
E)comb
Q71: Charles Darwin wrote that members of the
Q72: Animals obtain energy through photosynthesis. True or
Q75: An arthropod exoskeleton is composed of:
A)cellulose.
B)calcium carbonate.
C)silica.
D)chitin.
E)lignan.
Q76: Groups of similar cells that function together
Q76: Of all of the invertebrate phyla, only
Q77: An animal whose body cavity is completely
Q78: Chordates and echinoderms are both protostomes. True
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