Pinworms and hookworms belong to the phylum

A. Porifera.
B. Cnidaria.
C. Platyhelmintes.
D. Nematoda.
E. Annelida.


D. Nematoda.

Biology & Microbiology

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Animals covered by eight overlapping shells on their dorsal surface are

a. chitons. b. octopuses. c. shrimp. d. crabs. e. lobsters.

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When the oxygen level in the blood is low, which of the following secretes erythropoietin, causing an

increase in red blood cell production? a. lungs b. kidneys c. liver d. spleen e. pancreas

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Memory cells that form during a primary immune response circulate in the blood for

a. several days. b. weeks. c. months. d. many years. e. a few minutes.

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Which bone in the body does not articulate with any other bone?

A. coccyx B. temporal C. scapula D. hyoid E. maxilla

Biology & Microbiology