Different forms of the genes and stressful events work together to increase the risk of depression. dopamine serotonin norepinephrine gaba

The right option is Serotonin

Serotonin is a chemical manufactured in the brain and it acts as a neurotransmitter by transferring messages from one area of the brain to another thereby influencing various psychological and other body functions. Brain cells associated with memory, mood, appetite and some social actions are influenced by serotonin. Activities in the brain such as low brain cell production of serotonin or the inability of serotonin to get to the receptor sites may influence mood thereby resulting in depression.

The answer is Serotonin

Explanation:

Serotonin is a concoction produced  in the mind and it goes about as a synapse by exchanging messages starting with one region of the cerebrum then onto the next accordingly affecting different mental what's more, other body capacities. Cerebrum cells related with memory, mind-set, hunger furthermore, some social activities are affected by serotonin. Exercises in the mind such  as low cerebrum cell creation of serotonin or the failure of serotonin to get  to the receptor locales may impact inclination in this way bringing about sorrow.

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

the answer is b)3/8x+1