Recycling cells division. meoisis theroy
Answer: afforestation
Explanation:by planting trees they would be able to "inhale "the carbon iv oxide and in exchange exhale Oxygen
I believe there has to be enough activation energy for a reaction to occur in the first place, if that is what you are referencing
I think the answer is (4) using large amounts of some materials that cannot be renewed :))
i hope this be helpful
* happy new year *
