It is C. Nitrogen. Nitrogen is 78% of the atmoshere
Even though facilitated diffusion involves transport proteins, it is still passive transport because the solute is moving down the concentration gradient. ... A channel protein, a type of transport protein, acts like a pore in the membrane that lets water molecules or small ions through quickly.
The answer should be A capillaries
Answer: they both suggest that snakes evolved from an ancestor with legs
Explanation:
An unspecialized cell that can give rise to one or more different types of specialized cells, such as blood cells and nerve cells. Stem cells are present in embryos and in various tissues of adult organisms
