Question

a researcher is culturing mouse cells in the laboratory. when the researcher treats cells with four vitamins—w, x, y, and z—these cells survive and grow; the researcher knows that some of these vitamins are essential nutrients. however, when the researcher treats cells by removing one vitamin at a time, the following results are obtained: vitamin w, cells live; vitamin x, cells live; vitamin y, cells die; vitamin z, cells die. based on these results, which of the vitamins are likely essential nutrients?
vitamin y
vitamin z
vitamin x
vitamins y and z
vitamin w
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Explanation:

Essential nutrients are required for cell survival/growth. When W or X is removed, cells still live, so they are non-essential. When Y or Z is removed, cells die, meaning these two are essential.

Answer:

vitamins Y and Z