As a cell grows, its volume increases, but the cell becomes less efficient in transporting materials into and out of the cell. What process allows the cell to remain efficient?
A apoptosis
B) meiosis
C) mitosis
D) mutation

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hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

if you listed your answers right then i believe your answer is b.