Answer:
The reasons are
(i) These resources provide a variety of essential environmental services like production of oxygen, reduction of carbon dioxide, maintaining the hydrological cycle etc.
(ii) These resources are essential for preserving ecological processes like fixing and recycling of nutrients in the soil, watershed protection, circulation and cleansing of air and water etc.
(iii) Human beings utilise the plant and animal resources for their long term survival. Examples are milk from cows, cotton for making clothes etc.
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