Epithelial cells protect tissues
It is called cell differentiation this makes embryonic cells would become specialized cells. This occurs threw a process that is called gene expression
Blood type O can be given to anyone.
When babies are born, their brains contain about a hundred billion of neurons. However, a few of these brain cells are connected. At age three, there are one thousand trillion connections formed. The brain starts to cut off unused connections at the age of eleven.
