Question

Researchers believe that genetic factors influence happiness by means of determining the availability of norepinephrine in the brain. the likelihood of developing mental illness. the set point around which happiness tends to settle. the speed of transmission of neural messages. the sensitivity of dopamine receptors.

Answer 1

Researchers believe that genetic factors influence happiness by means of determining THE SET POINT AROUND WHICH HAPPINESS TEND TO SETTLE.
Scientist who worked on the factors that determine happiness carry out scientific investigation which determine the factors that are responsible for happiness in people. The scientists believe that happiness is related to one's genetic make up