The common ancestor of sponges and other animals was probably:
A) unicellular.
B) multicellular without tissues.
C) multicellular with tissues but without organ systems.
D) multicellular with tissues and a few organ systems.
E) multicellular with tissues and many organ systems.
Correct Answer:
Verified
Q2: Damage to the embryonic ectoderm would show
Q4: Anemones have no:
A)endoderm.
B)mesoderm.
C)ectoderm.
Q5: In the animal kingdom, cephalization is:
A)development of
Q6: How many tissue layers are in the
Q7: The major difference between protostomes and deuterostomes
Q8: Which of the following animal phyla is
Q9: A _ is an organism whose body
Q11: Which of the following characteristics is often
Q14: An arthropod embryo has _germ layer(s).
A) no
B)
Q18: A cnidarian, which is radially symmetrical, has
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