Which statement is true? a person's maturational, cultural, and historical experiences affect every genetic trait. genes have an effect on the final expression of all traits. genes determine whether a person becomes an alcoholic or develops type 2 diabetes. genetic expression of traits cannot be studied.

Genes have an effect on the final expression of all traits.

Explanation:

Genes are the stretch of DNA that code for a specific protein and thereby regulate genetic trait. Though environmental factors such as hygiene, nutrition, etc. also affect some of the traits of the organisms, genes are the major determinant of the expression of genetic traits.  

For example, irrespective of nutrition, physical activity, health, etc., the height of an individual depends on its genes for the height that it has obtained from its parents.  

answer: a) a compound microscope has a greater magnification ability than a simple microscope.

explanation:

b. the carbon cycle ensures living things have a source of hydrogen