The ability to perceive a bitter taste from certain chemicals, including ptc, has been linked to certain alleles. which of the answer choices would provide an explanation for the fact that almost all nonhuman primates have the "taster" phenotype, whereas the human population has a significant percentage of "nontaster" phenotypes?
a. the advantage to being able to taste bitter compounds would keep you from eating poisonous compounds, an advantage not needed in the human population anymore. b. the advantage to not being able to taste bitter compounds means that humans are more likely to eat vegetables and hence live longer than nonhuman primates. c. nonhuman primates only eat foods that are not bitter, so the phenotype of tasting bitter compounds was not selected against. d. humans needed the ability to not taste bitter compounds, so the mutation happened.

just go with your heart buddy

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.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101