Gastrin causes Group of answer choices increases in the secretion of chief cells and parietal cells. the conversion of pepsin into pepsinogen. the upper esophageal sphincter to open. the pyloric sphincter to alternately open and close. inhibition of HCl secretion.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.