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Use "chemistries" in a sentence
"If neuroscientists discovered that nuns had different brain chemistries from everyone else, very few people would accept this as evidence that they suffered from a MI/BD."
"If neuroscientists discovered that homosexuals had different brain chemistries from heterosexuals, far fewer people would accept this as evidence that they suffered from a MI/BD."
"If neuroscientists discovered that mass murderers and people who claim to be Jesus had different brain chemistries from other people, most everyone would accept this as evidence that they suffered from a mental illness/brain disorder (MI/BD)."