Is it really true that homosexuality can be explained by epigenetics?

Extra Links for Lectures
Scientists claim that homosexuality is not genetic�but it arises in the womb
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Liar Truthteller Brain Teaser - Khan Academy
Anatomy of a Neuron - Khan Academy
Neuronal Synapses (Chemical) - Khan Academy
Electrotonic and Action Potentials - Khan Academy
Saltatory Conduction in Neurons- Khan Academy
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