To raise an arm upward, the muscle on one side of it contracts. What happens to the muscle on the opposite side of the arm? contracts relaxes both contracts and relaxes neither contracts nor relaxes

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait. 

That's an ear piece it allows them to hear what they want so they don't mess up

The parents of an infant with newly diagnosed cystic fibrosis ask a nurse what causes the foul-smelling, frothy stool. what is the  best  response by the nurse?

It would be 5/12=0.47% which would round to 50%hope my answer has you : )