According to modern cell theory, all cells arise from pre- existing cells by what process?
a
Cell division
b DNA replication
С
Sexual reproduction
d Cellular respiration

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

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Which step is not included in the step approach to calculating the greatest common divisor?