Growth factors are local regulators that: are produced by the anterior pituitary are produced by the anterior pituitary are modified fatty acides that stimulate bone and cartilage growth are modified fatty acides that stimulate bone and cartilage growth are found on the surface of cancer cells and stimulate growth and deelopment of target cells. are found on the surface of cancer cells and stimulate growth and deelopment of target cells. convey messages between nerve cells. convey messages between nerve cells. bind to cell-cell receptors and stimulate growth and development of target cells.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

not: both offer magnification to the atomic level.