Gina jumps with fear as she feels a hand on her shoulder while walking on a deserted path across campus. Her fear evaporates when she hears her boyfriend's voice saying, "What are you doing out so late, Gina?" What brain structure played a key role when Gina's fear evaporated?

A. medulla
B. hippocampus
C. cerebral cortex
D. amygdala

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.

Which was not a reason why canals were built in florida