Which is the best definition of activation energy

the energy required to break the bonds of reactant molecules

That is the best answer.

is the last one

the energy required to break the bonds of reactant molecules

Explanation:

thats the best and it shows more details about  activation energy

Hope this helps :)

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

it would lead to upper respiratory infections and pneumonia.