The necessity to choose between two incompatible needs, demands, opportunities, or goals is called ______

Suicidal ideation refers to

a deliberate act of self-destruction that does not end in death. thinking about suicide. the belief that suicide is an effective way of getting back at one's parents or peers. feelings of sadness or hopelessness.

________ levels spike when a person or animal is afraid or under stress, which gives a species an evolutionary advantage

a. Endorphin b. Testosterone c. Progesterone d. Neurotransmitter