First- b
second - d
third - c
fourth - a
This might help,the presence of hydrochloric acid creates an acidic environment within the stomach that is needed to convert pepsinogen to pepsin. Mucus that is produced by the epithelial cells of the stomach help protect the lining of the stomach from the corrosive hydrochloric acid and pepsin.
Traits are inherited by genes on a chromosomes from the Mother and Father of the Offspring.They are passed down from our parents to us and there is 26 different chromosomes which determine what you look like.
Answer:
biosphere is the answer bro
