Social darwinism was used as a justification

Social Darwinism was a sociological theory popular in late nineteenth century europe and the United States. Maybe?

Hi! after fertilization occurs, the zygote goes through mitosis and then differentiation (aka specialization of cells) to have a variety of cells that perform different functions. this allows for the creation of tissues and so on, all of which were once stem cells with no specific function.i hope i !

^^^ i agree with the person above me, good luck on whatever : )