Answer:
Matter is anything that mass and can occupy space.
Atoms are the smallest particles that takes part in a chemical reaction.
A molecule is a that can exist on its own
<em><u>Hydrochloric acid</u></em> is the acid in gastric juice that is lethal to many pathogens.
This hydrochloric acid activates pepsinogen into the pepsin enzyme which then aids in the digestion by breaking down the bonds linking amino acids. This process is known as proteolysis. In immunology, it has been postulated that one main function of the inherent hydrochloric acid in gastric juices is to prevent microorganisms from reaching the small intestine where it can potentially cause diseases or worse, get access to other parts of the human body.
- less than 50 centimeters of rainfall per year
- coarse-textured soils
- temperatures that change drastically between the day and night time
- high evaporation rates
- drought resistant vegetation
I bet that the answer was D too. I hope this will help you. :)