Why are the male testes located in the scrotum, outside the abdominopelvic cavity?.

Because sperm production is sensitive to heat if they get too hot, cells in the tubules will not develop into sperm in temperature above 37. This is why testes are out side the body where they are cooler.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah