Leo Buss in his book The Evolution of Individuality proposes that much of the evolution of development in animals reflects the conflict between selective pressures acting at the level of the cell and those acting at the level of the multicellular individual.
Leo Buss no seu libro The Evolution of Individuality propón que gran parte da evolución do desenvolvemento dos metazoos reflicte o conflito entre as presións selectivas que actúan a nivel da célula e as que actúan a nivel do individuo multicelular.