Answer ASAP:
What happens when a muscle contracts?
A.) Calcium combines with ATP to produce sarcomeres.
B.)Calcium produces contractions.
C.)Myosin heads attach to and pull on a series of actin-binding sites.
D.)Actin produces myosin and ATP.

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.

A60-tooth gear is connected to a 72-tooth gear.if the smaller gear turns 12 times,how many turns does the larger gear make?

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4