Lately, Buck has been gaining weight, even though his diet and activity levels have not changed. If his doctor suspects that there is an endocrine problem affecting Buck's metabolism, he would start by examining Buck's ________.

If a man experiences infertility related to sperm cells, all of the following are possible EXCEPT

A) he is ejaculating too few sperm cells. B) his sperm cells are poor "swimmers." C) he has very poor sleeping habits. D) his sperm cells have many more defects than normal.

The number of people in long-distance relationships has been on the rise

a. True b. False Indicate whether the statement is true or false