It also creates the bone, the kidneys, the pancreas, the liver and many other organs of our body. So the question we want to address in this lecture is what exactly allows embryological development to actually take place in the first place? So as it turns out, there are four individual processes that have to work together for embaloglogical development to actually take place the way that it does in our body. So these four processes includes cell proliferation, cell growth, cell differentiation and morphogenesis. So let's begin with cell proliferation. So we know that we begin with a single zygote, a single cell.