Clams, oysters, and scallops are called bivalves because they have

a. a pair of eyes.
b. bilateral symmetry.
c. a double foot region.
d. a shell made up of two halves.
e. two sexes.


D; The shells are the valve, hence the name. Bivalves do not all have a pair of eyes (choice a) and their foot region is not double (choice c). Animals typically have bilateral symmetry (choice b) and often have two sexes (choice e), so this would not be a particularly distinctive feature on which to base a name.

Biology & Microbiology

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The ___________ nuclei are masses of gray matter deep within each cerebral hemisphere, that integrate motor commands to ensure that the proper muscle groups are stimulated or inhibited.

Fill in the blank(s) with the appropriate word(s)

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What will be an ideal response?

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Which of the following cells would MOST likely be damaged by penicillin?

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