 Scientists such as ecologists and behavioural geneticists now see it as obvious that both factors are essential, and that they are intertwined, especially through the mechanisms of epigenetics.The American biologist E. O. Wilson founded the discipline of sociobiology, founded on observations of animals such as social insects, controversially suggesting that its explanations of social behaviour might apply to humans.In 1892, the Austrian biologist August Weismann proposed that multicellular organisms consist of two separate types of cell