How many tissue layers are in the embryos of sponges?
A) None
B) One
C) Two
D) Three
E) Four
Correct Answer:
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Q2: The common ancestor of sponges and other
Q3: Which germ layer gives rise to the
Q4: A_ is an organism whose body cavity
Q5: Which of the following animal phyla is
Q6: Anemones have no
A) mesoderm.
B) endoderm.
C) ectoderm.
Q8: The only animals that lack tissues are
A)
Q9: Which of the following characteristics is often
Q10: A multicellular organism that lacks cell walls
Q11: Damage to the embryonic ectoderm would show
Q12: Organisms that are radially symmetrical have_ embryonic
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