Deborah, Skloot, and Zakariyya were meeting in a lab at Johns Hopkins to see a) Dr. Hopkins
b) research studies
O c) Henrietta's cells
d) blood test results

idk

explanation:

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.