Which of the following processes requires energy?
(a) Movement of calcium into a cell.
(b) Secretion of mucus by a cell
(c) Entry of oxygen into a cell.
(d) Water absorption by a cell.
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Which of the following processes requires energy?
(a) Movement of calcium into a cell.
(b) Secretion of mucus by a cell
(c) Entry of oxygen into a cell.
(d) Water absorption by a cell.
Which of the following processes requires energy?
(a) Movement of calcium into a cell.
(b) Secretion of mucus by a cell
(c) Entry of oxygen into a cell.
(d) Water absorption by a cell.
(b) Secretion of mucus by a cell