The common ancestor of sponges and other animals was probably
A) multicellular with tissues and a few organ systems.
B) unicellular.
C) multicellular without tissues.
D) multicellular with tissues but without organ systems.
E) multicellular with tissues and many organ systems.
Correct Answer:
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Q3: A _ is an organism whose body
Q4: Which of the following characteristics is associated
Q5: The only animals that lack tissues are
A)
Q6: Between the organs and the body wall,
Q7: How many tissue layers are in the
Q10: Which of the following animal phyla is
Q11: The major difference between protostomes and deuterostomes
Q12: Organisms that are radially symmetrical have_ embryonic
Q14: An arthropod embryo has _germ layer(s).
A) no
B)
Q18: A cnidarian, which is radially symmetrical, has
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