Most of the recovery of materials from municipal solid wastes is in paper and paperboard , accounting for almost of all material recovered.
a. 19.7%
b. 27%
c. 57%
d. 68%

The correct option is C. 57%

Explanation:

Recycling can be defined as the usage of resources again and again by refining them. From the solid waste, resources such as plastic, elements like copper etc can be refined and reused. It is made sure that the necessary contaminants are removed before paper is recycled.

Solid municipal waste is widely used to recycle paper which is then used in making newspapers, office papers and also to be transferred to other countries to raise the economy.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.