Identifying with mainstream culture strengthens ethnic identity in most groups

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

If a researcher wanted to know how loudly a person must speak in order to be heard above the noise of two other simultaneous conversations, the researcher would likely measure the ________

a. difference threshold b. marginal intensity c. relative magnitude d. absolute threshold