One trend in the evolution of animals is the increase in the number of tissue (germ) layers during embryonic development. Flatworms and more complex animals have_________ layers.
A) two
B) three
C) four
D) five
E) six
Correct Answer:
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Q10: A multicellular organism that lacks cell walls
Q11: Damage to the embryonic ectoderm would show
Q12: Organisms that are radially symmetrical have_ embryonic
Q13: Between the organs and the body wall,
Q14: An arthropod embryo has _germ layer(s).
A) no
B)
Q16: In the animal kingdom, cephalization is
A) development
Q17: The skin and nervous tissues develop from
Q18: A cnidarian, which is radially symmetrical, has
Q19: All animals with tissues have
A) radial symmetry.
B)
Q20: Which of the following characteristics is associated
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