Astress is considered a "bad" stress when it

a. keeps a person from feeling good.
b. doesn't lead to a productive end.
c. challenges a person to do better.
d. cannot be eliminated

Employers are required to provide guardrail, safety net, or personal fall protection systems to protect workers from falling off unprotected sides/edges of residential roofs that are feet or more above a lower level.

Which of these is a controllable risk fator for disease

How could natural selection best be used to explain the evolution of the white fur of arctic fox