Answer:
Cold fronts form when a cooler air mass moves into an area of warmer air in the wake of a developing extratropical cyclone.
Explanation:
The warmer air interacts with the cooler air mass along the boundary, and usually produces precipitation. Cold fronts often follow a warm front or squall line.
C is the answer I already took biology
Enzymes are specialized proteins that speed up chemical reactions, biological catalyst.
Stem stands for B) science, technology, engineering, and mathematics