Which is an example of a negative feedback? a) the accumulation of blood platelets, which cause blood clotting, is triggered by a tear in the lining of the blood vessel. b) the production of red blood cells, which transport oxygen, is triggered by a low level of oxygen in the blood. c) during childbirth, the secretion of hormone oxytocin, which intensified the contractions, is triggered by uterine contractions.

The series of transgressions and regressions that produce cyclothems were likely produced by

This organism is not capable of performing photosynthesis. (horseshoe crab) true false

Which excerpt from the land, part 4 best supports the claim that paul is a talented horseback rider? a/“figure that says more than anything else! now, i want to ride that stallion! " b/my daddy shook his head. "paul only rides horses he knows. ” c/? i glanced over at the other rider. the fellow was older than i, and had the weight of a man on him. d/a man out of alabama, man name of ray sutcliffe, told my daddy i was such a good rider, he wanted me to ride some races for him.