Answer:
A. indicate potential danger in environment
Explanation:
Here, the definition is given and asked for a word that is defined.
The rearrangement of atoms by breaking and reforming chemical bonds is called a chemical reaction.
Hence, "chemical" is the missing word.
A <u>chemical</u> reaction is the rearrangement of atoms by breaking and reforming chemical bonds.
3!! 1,2,4 counting by one’s counting by 2s and 4s
