which of the following statements concerning sexual orientation is false? question 27 options: a) some researchers now estimate that sexual orientation is from 30 to 70 percent genetic. b) neuroscientists have shown that there is no significant difference in the brain structures or brain chemicals of heterosexuals and homosexuals. c) homosexuality is not caused by hormone imbalances in adulthood with the hormone levels of most gay men and lesbians being within the normal range. d) there is little difference in the development of children with gay or lesbian parents and those who have heterosexual parents.