Adolescence begins at approximately the same time as:

A) middle school.
B) puberty.
C) a growth spurt.
D) age 12.

B

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Metabolism:

a. always involves insulin from the pancreas. b. involves only glucose and enzymes. c. is the same as the digestive process. d. is defined as the chemical processes occurring within a living cell or organism

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Leukocytes are the workhorses of the immune system and are produced in the:

a. pancreas. b. liver. c. intestines. d. bone marrow.

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