Current research into neurotransmitter systems has produced the "" hypothesis, which states that when serotonin levels are low, other neurotransmitter systems become dysregulated and contribute to mood irregularities.

permissive

Explanation:

Here is the complete question:.

Current research into neurotransmitter systems has produced the " " hypothesis, which states that when serotonin levels are low, other neurotransmitter systems become dysregulated and contribute to mood irregularities.

a. incompatibility

b. lock-and-key

c. permissive

d. pathoneurosis

it's c. (to reduce the greenhouse effect/carbon gasses)

we need additional information in order to determine the cause of death for anna garcia. there are at least 3 things with explanation included as to why we need them are as follows: