Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells.
Answer:
i
Explanation:
long chains of repeating subunits, called nucleotides
A nucleotide is the basic building block of nucleic acids
The ones about enzymes are chemical digestion and the ones about chewing are mechanical digestion.
a chemical element or substance required in trace amounts for the normal growth and development of living organisms.
