Select the following phylum that includes animals that are unsegmented, acoelomate, and have a digestive cavity with a single opening.
A. Platyhelminthes
B. Annelida
C. Cnidaria
D. Nematoda
E. Rotifera
Answer: A
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a. sedimentary rocks. b. limestone. c. metamorphic rock. d. volcanic rocks. e. meteorites.
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Of the 23 pairs of human chromosomes, 22 pairs are homologous and are found in both males and females. These are called ________.
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