Biology, 11.05.2021 09:40, hsbhxsb

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when buildings are closed to conserve energy.

Energy can be used more efficiently getting more
each unit of energy.

Materials, such as gravel and sand, are technically
but there is so much of the available that we are unlikely to ever run out.

can be regenerated or grow so rapidly that they reappear at the same rate or faster than they are used.
we make sure resources will be

When we practice available in the future.

are resources that cannot be regenerated on a useful
timescale.

If Nation A needs a natural resource that Nation B has a lot of why might Nation A have trouble getting that resource from Nation B?

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