Assertion: homosexual's orientation | /r/CreatedBy | epigenetic
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Source sentences:
text: Over the past century, slavery has been abolished in the U.S., Canada, etc.; women have been given the vote, are now often permitted to become clergy, etc., and are now generally treated as equals; LGB persons are now becoming recognized as having one of three normal and natural sexual orientations caused by epigenetics -- a layer on top of their DNA that turns various genes on and off; transgender persons have generally been found to have a male body and female brain structures or vice versa; skin color is now recognized as being caused by a very few genes out of over 20,000 human genes in our DNA.