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(Says I have to cite my sources so here goes: I just copy/pasted your question into Google lol)
I think is alternative a because that includes the earth
By elevation of the atmosphere
Since stock resources are consumed over a long period of time, they are not renewable. They often indicate their quantity using absolute values rather than rates. Coal and petroleum reserves are two examples.
There are resources that are known to exist that could be used. Resources that have been created, whose amount and quality have been determined for use, and which are currently in use, are referred to as developed resources. Future-use resources are defined, and their current value is acknowledged. However, they aren't being utilized right now. Resource stocks create and market a variety of goods. These include oil, copper, uranium, tin, fertilizers, and oil. Although developing a distinctive product is difficult for resource producers, businesses can differentiate themselves by identifying and producing their commodities swiftly and profitably.
Learn more about Resources here:-
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<span>The steppes of southern Russia, the African veldt and the pampas of Argentina are good examples of grassland biomes.</span>
