What is the organic compound that regulate certain chemical reactions

In which way does nicotine cause addiction? by stimulating the brain's pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety

Is psychology a science? use evidence form the article to explain you answer.

Ruth is 44 years old. at her medical checkup, her doctor notices that ruth's lymph nodes are enlarged. after some blood tests and a ct scan, ruth's doctor diagnoses her with ( ) , a cancer that typically starts in the lymphocytes and can spread to the bone marrow.