Verified Answer :

To activate means to start, and activation energy starts the reaction, which means activators start the reaction. 

Answer: Activators

Answer: Activators

Explanation:

Inhibitor is a substance that slows down or prevents a particular chemical reaction.

Activator is a substance that stimulates or initiates a chemical process.

Centriole is an organelle that helps in cell division, or make copies of themselves. Centrioles are only found in animal cells.

Vacuoles are strong central storage compartment in organisms.