B
...............................
Answer:
by changing heart rate and stroke volume
Explanation:
Factors affect cardiac output by changing heart rate and stroke volume. Primary factors include blood volume reflexes, autonomic innervation, and hormones. Secondary factors include extracellular fluid ion concentration, body temperature, emotions.
An embryo<span> with the XX genotype is a </span>female<span>, while the XY genotype </span>produces<span> a male.
Hope this helps, do with it as you may!</span>
