According to the textbook's discussion of anxiety:
a) panic attacks are called the fear of fears because people feel that they are dying.
b) in many situations it is sensible to feel anxiety, and in fact, these emotions are adaptive.
c) post-traumatic stress disorder occurs within the first two days after a trauma.
d) it is unusual for a mentally healthy person to experience a panic attack.

A) panic attacks are called the fear of fears because people feel that they are dying.

Explanation:

Anxiety is a situation of fear and tension which can be felt mentally as well as physically. Discussion of anxiety can be define as the panic attacks which are associated with the fear of dying.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u