1: Decomposition reaction
2: Combination reaction
3: product
4: Reactant
Enzymes
i got this from google
Enzymes<span> are soluble protein molecules that can speed up chemical reactions in cells. These reactions include respiration, photosynthesis and making new proteins. For this reason </span>enzymes<span> are sometimes called biological catalysts</span>
The correct answer is letter D: Quartz.