enzymes are proteins. they are playing important role in normal functioning and survival of an organism. enzymes are substrate specific. each enzyme is specific for its substrate and in absence of this enzyme the metabolism of that substrate stops.
Explanation:
according to above discription without enzymes survival of an organism is not possible.
Answer: is D. Mercury was used to treat many illnesses long ago, and after being deemed safe by modern doctors its use has increased in the past 100 years.
