Answer: d)planting multiple crops together on a field and harvesting them at different times.
Explanation:
Sustainable use of natural resource can be define as the use of resource in a manner so that they remain available for present and future generation.
d)planting multiple crops together on a field and harvesting them at different times is the correct option this is because of the fact that if multiple crops are grown on the same field. This will lead to addition of minerals to the soil directly by the growth of plants or by symbiotic association of plant roots with the soil microbes. This will keep the soil in fertile state so that the future crops can be grown over it.
