The skin and nervous tissues develop from which germ layer?
A) ectoderm
B) endoderm
C) mesoderm
D) mesoglea
E) protoplasm
Correct Answer:
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Q12: Organisms that are radially symmetrical have_ embryonic
Q14: All animals with tissues have:
A)symmetrical bodies.
B)bilateral symmetry.
C)radial
Q15: One trend in the evolution of animals
Q15: The only animals that lack tissues are:
A)sponges.
B)chordates.
C)chytrids.
D)cnidarians.
E)nematodes.
Q16: A multicellular organism that lacks cell walls
Q19: Between the organs and the body wall,
Q20: Which germ layer gives rise to the
Q21: What causes schistosomiasis, a devastating disease that
Q22: Giant squids are classified as:
A)arthropods.
B)mollusks.
C)echinoderms.
D)chordates.
E)platyhelminthes.
Q23: Which cnidarian is the basis of an
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