What is the most likely reason humans have only two nipples?
A. Our primate ancestors probably had litters.
B. Primates generally have only one offspring.
C. Having two nipples is associated with upright walking (bipedality).
D. Most mammals have only two nipples.
E. The number of nipples was reduced in humans due to sexual selection.
B. Primates generally have only one offspring.
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a. True b. False Indicate whether the statement is true or false
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The thymus is in the mediastinum behind the sternum
Indicate whether the statement is true or false