_____ is one of the primary sex characteristics.
A) Onset of menstruation
B) Breast enlargement
C) Appearance of pubic hair
D) Lowering of the voice
A) Onset of menstruation
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Perceptions of marital quality over the first ten years of marriage show a decline in the early years.
Answer the following statement true (T) or false (F)
Insulin increases the entry of tryptophan into the brain by ____
a. weakening the blood-brain barrier b. converting tryptophan into a compound that more easily enters the brain c. increasing metabolic activity only in those areas of the brain that use tryptophan d. causing certain competing amino acids to enter other cells, outside the brain
Alan always turns the aquarium light on before putting fish food into the tank. After a while he notices that the fish swim to the top to look for the food as soon as he turns on the light. In this example, the __________ is the unconditioned stimulus (US).
A) tank B) fish swimming to the top C) fish food D) aquarium light
How is labor initiated?
a. Time alone determines this. b. by the release of oxytocin from the mother's brain c. by the secretion of pitocin from the mother's endocrine system d. by the secretion of hormones by the fetus