Answer:
the "they" being referred to is the scientists
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.
Someone has asked this question before and I answered it I don’t want to type it all over again so here
Answer:
11years ,,,,,,,,,,,,,,!!!!!!!\*!*!,\\***\*\