2 ms·
Lactose intolerance in adulthood is the default for most/all mammals. There is some subset of humans who grew to depend on drinking milk from cows who have adap
by simiones 6y ago
Lactose intolerance in adulthood is the default for most/all mammals. There is some subset of humans who grew to depend on drinking milk from cows who have adapted to continue producing lactase for their entire lives, but this has no spread to all humans.