QUESTION 4 1 points Saved For most of human history, which of the following sour

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QUESTION 4 1 points Saved For most of human history, which of the following sources was relied on to provide essential Nitrogen and Phosphorous for crops? O beans and peas O the haber-bosch process animal manure O phosphate rock QUESTION 5 1 points Save Answer In the United States, National Parks have been O critiqued for the fact that visitors to National Parks are predominately white and middle and upper class O have been at the center of the debate between conservationists and preservationists O touted by the filmmaker Ken Burns as "America's Best Idea" O all of these answers

Explanation / Answer

4) animal manure

Animal manure contains nitrogen, phosphorus, potassium and nutrients. So it has been used to supply  nitrogen and phosphorus to crops for most of the human history.

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