What significant contribution did emperor constantine make to roman history? a. he made vast contributions in science and medicine b. he was a great philosopher and writer c. he supported christianity d. he introduced a special legal system

C. he legalized Christianity and worship.

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 !