Ling is a physiologist. Which would most likely be the main focus of her studies? how atoms bond to form different kinds of matter
how subatomic particles interact and make up atoms
how certain molecules affect the function of the human heart
how the structure of the human brain may differ between humans

how certain molecules affect the function of the human heart

Explanation:

Physiology deals with the study of the parts of the body and how they function properly under optimal conditions and also their functional responses to other types of conditions.

In the example above the option which matches this definition is how certain molecules affect the function of the heart. These molecules helps in determining how they will affect the normal functioning of the heart.

elevated levels of blood glucose (hyperglycemia) lead to spillage of glucose into the urine, hence the term sweet urine.

having the certification could make the person more required to do a certain thing then another.this could also lead to different job offers or opportunities.