A fever is a response to a disease-causing agent infecting the body. Raising one’s body temperature changes the shape of enzymes in the agent so it cannot reproduce. Which statement best describes a fever?
a.A fever is an external response to an internal stimulus.
b.A fever is an external response to an external stimulus.
c.A fever is an internal response to an external stimulus.
d.A fever is an internal response to an internal stimulus.