The answer is B (speed up chemical reactions).
Acid-laden ingesta flows out of the stomach, into the small intestine. Acid in the small intestine stimulates secretion of the hormone secretin<span> from endocrine cells in the intestinal epithelium.</span>
You could do this: do the same shape but one shaded and one not
To show that female expressed that trait
Hope this helps you
Hi!
The answer is B) it should be repeated by other scientists.
Hope this helps!
-Payshence xoxo