If there was more than one planet on each orbit, eventually they would collide with each other.
C. CO<span>2 and other greenhouse gases slowing the escape of heat from earth. </span>
For example, when a government imposes an import tariff, it adds to the cost of importing the specified goods or services The additional marginal cost added by the tariff discourages imports, thus affecting the balance of trade.
The answer is <u>C; biosphere and lithosphere</u>.
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