Charles Darwin wrote that members of the phylum ________ are particularly important for agriculture because they mix and aerate soil.
A) Cnidaria
B) Platyhelminthes
C) Annelida
D) Arthropoda
E) Nematoda
Correct Answer:
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Q70: A closed circulatory system is characteristic of:
A)flatworms.
B)annelids.
C)cnidarians.
D)sponges.
E)comb
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A)cellulose.
B)calcium carbonate.
C)silica.
D)chitin.
E)lignan.
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