Answer:
enzyme are protein that speed chemical reaction ..
Replication of the DNA and cell growth occur during the S-Phase of the cell cycle.
Answer:
Explanation:
During a physical change, the arrangement of particles may change but the mass, number of atoms and number of molecules will stay the same. ... During a chemical change, the mass and number of atoms is conserved, but the number of molecules is not always the same. Chemical reactions involve large changes in energy.
