Solution:
Option (c) is the answer
Because it provides certain organic compounds and minerals to the soil, the residue remaining after methane production from calf dung is used as manure.
As a result, the right response is ‘used as manure.’
Solution:
Option (c) is the answer
Because it provides certain organic compounds and minerals to the soil, the residue remaining after methane production from calf dung is used as manure.
As a result, the right response is ‘used as manure.’