I’m pretty sure the answer is A, but it could be D
They are said to be “denser” than air. what happens is that light slows down when it passes from the less dense air into the denser glass of water. this slowing down the ray of light also causes the ray of light to change directions. it is the change in the speed of the light that causes refraction.
Put a end to aggressively
<em>by definition- a stem cell is an undifferentiated cell of a multi-cellular organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.</em>
an example
Stem cells have the potential to be whatever they want to be. Stem cells are able to develop into many different types of cells and can repair your body.
there are two types
adult stem cells and embryonic stem cells
It does in fact that's really what natural selection is all about it uses the characteristics that would better help the organism survive therefore making the species thrive
