<span>The minimum amount of energy needed to get a chemical reaction started is called the activation energy.
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Answer: This is the definition if that's what you want.
Explanation:The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity can neither be added nor be removed.
A.) independent variable.
the control was or would be the plant at the window. the dependent is the growth of each plant. the constant is the amount of water
You can find the makeup of the substance, such as water having two hydrogen atoms and one oxygen.
