Fact 1: All chemical reactions require activation energy to get started.

Fact 2: Activation energy is the initial input of energy required to get the reaction started.

Given the two facts above, answer the question "All chemical reactions require the initial input of energy to get the reaction what?" with the following options: 
- made
 - state
 - started
 - Decibels
 - over
 - heat
 - finished
 - removed


 

   started      