The common ancestor of sponges and other animals was probably
A) multicellular with tissues but without organ systems.
B) multicellular with tissues and a few organ systems.
C) multicellular without tissues.
D) multicellular with tissues and many organ systems.
E) unicellular.
Correct Answer:
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Q1: The major difference between protostomes and deuterostomes
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.
Q7: How many tissue layers are in the
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
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