Answer:
Embryonic stem cells are capable of self-renewal and limited differentiation
Explanation:
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Answer:
4
Explanation:
This is the answer because I have tested it and got it correct. As oxygen-rich (and carbon dioxide-poor) blood travels by a cell the oxygen diffuses through the cell membrane to the area of lower concentration inside the cell. It can do this easily because the oxygen molecule (O2) is very small and has no charge or polarity. The oxygen is used up rapidly by mitochondria.
It is likely to be a negative feedback. D is formed from B or C. D reduces the activity of the enzyme that converts A.
