The times when developing structures in the embryo are most prone to damage by environmental events are called

Jeff is 13 years old and he has recently noticed some remarkable changes in himself. Over the past few months his voice has started to change, growing deeper. He has begun to grow pubic hair, as well as the beginnings of a facial beard

He is also filling out, with his muscles developing rapidly. These changes in Jeff are probably due to the action of _____________. a. gonads b. thyroid gland c. pineal gland d. adrenal gland

The behavioral effects of amphetamine are due to

a. the blockade of reuptake of dopamine. b. a change in transporter levels in the postsynaptic membrane. c. its ability to directly release dopamine from the terminal buttons. d. the blockade of reuptake of serotonin. e. its ability to directly release serotonin from the terminal buttons.