On the basis of research with twins, it seems clear that homosexuality and heterosexuality are determined by personal and social environments, and are uninfluenced by biological forces

The neurotransmitter associated with both schizophrenia and Parkinson's disease is a. GABA

b. norepinephrine. c. dopamine. d. serotonin.

Explain what range of reaction means in terms of genetics.

What will be an ideal response?