Embryonic Skin Cells is the correct answer.
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It would be A. Iron & Nickel.
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The answer is D
2 red and 2 roan
Since digestive enzymes function in several different pH environments (basic and acidic), the digestive system will have sections of varying pH.
I think the answer is A.
carbohydrates are needed to move ATP from cell to cell.
i am sorry if my answer was wrong .