Sickle cell disease is caused by a
a. change in one dna base.
b. change in the size of a chromosome.
c. change in two genes.
d. change in the number of chromosomes in a cell.

What system have glands found throughout the body that release hormones into the bloodstream

What are the components of an effective weight-training program? a. conditioning, progression, generalization, overwork, balance, and recovery b. overload, progression, specificity, regularity, recovery, balance, and variety c. overwork, coordination, motivation, conditioning, regularity, and variety d. consistency, progression, rest, regression, balance, and specificity

What are some physical consequences of drunkenness?