Discuss the  scientific evidence that supports the idea that  sexual orientation is greatly influenced by  biology. 

It's in the blood

Explanation: Sexuality is usually influenced by Biology because, sexual attraction; or love in this case, is usually brought on from genes passed on from previous generations,Sexuality can also be influenced by a parent with their preferred sexuality.

It can be said that science implies that there is a difficult interaction between biological factors, which conditions when a person is attracted to people of the same sex, the opposite sex or both.

Explanation:

The scientific evidence identifies five possible chromosomal regions, in these variants it is shown with a significant frequency that the individuals of a sample that comment have had relations with individuals of the same sex. Although it is noted that the link between biology and homosexual behavior is very complex, since different variants appear that are different between men and women, and without an association between the presence of these genes and a high or low proportion of homosexual relationships.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.