1) The basic unit of life a) molecule b) cell c) atom d) matter 2) The outermost layer of the earth a) crust b) mantle c) inner core d) outer 3) The green pigment of the plant. a) stomata b) chloroplast c) chlorophyll d) stromata 4) The largest part of the brain. a) cerebrum b) cerebellum c) medulla d) pons 5) The chemical formula of water. a) H2 b) OH2 c) H2O d) H2O2

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