What has been proven, is that too great a population of tourists in the national parks leads to trampling of flora. f. no change g. proven is that, h. proven is, that j. proven is that

The correct option is J “proven is that” since no comma is needed after the word “proven”. Grammatically speaking, commas are used to help in the meaning of a sentence by grouping and separating words or clauses. By using commas, a sentence can avoid misunderstanding, but in this case the comma is not necessary to have a clear meaning on its own.

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1. list two reasons why fossil fuels should continue to be used as a source of energy in america.