Sherine likes to sunbathe for several hours at a time without sunscreen or protective clothing. she says it’s healthy because it increases her vitamin d levels. what advice should sherine’s healthcare provider give her?

Sherine's doctor probably say that it is unhealthy to do that for hours at a time because she could develop skin cancer, and that she should apply a sunscreen with at least an spf of 50

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 !