Which of the following animal phyla is distinguished by a lack of tissues?
A) Sponges
B) Annelids
C) Flatworms
D) Roundworms
E) Echinoderms
Correct Answer:
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Q1: The major difference between protostomes and deuterostomes
Q2: The common ancestor of sponges and other
Q3: Which germ layer gives rise to the
Q4: A_ is an organism whose body cavity
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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