Which phrase describes an unknown or changeable quantity?
a. 3 feet 7 inches
o
o
b. 4 quarts in a gallon
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c. the height of the building times
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d. 2 o'clock in the afternoon

Hormones perform important functions within the reproductive system. during puberty, a number of changes occur in the body. which hormone is responsible for the development of these characteristics in the female? estrogen progestin progesterone testosterone