Something that affects the structure or function of an organism is referred to as a
a. modifier
b. rash
c. disease
d. symptom
-really need , pls.

Modifier is something that can affect the structure or function of an organism. Modifier is something refers to a thing or a substance that makes a partial change to a certain organism or certain thing.
Some common modifier examples are:
=> Your doctor repeated you diagnostic test exactly on the same day.
=> Your plastic surgeon repeated your nose surgery maybe because there’s something wrong on the first result.
=>  You trim your plant in order to have a nice shape when it grow.