Which aspect of a chemical reaction is affected by enzymes?

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

Nucleic acids offer variability because they contain alternate forms of genes called .