Twenty percent of Earth's oxygen is produced by the Amazon rainforest is a fact.Group of answer choicesTrueFalse

Oxygen makes up the majority percentage of both the human body and the Earth's crust. Oxygen also makes up a large percentage of which of the following?

Which natural resource is primarily responsible for producing oxygen and regulating the Earth's climate?a.Fossil fuelsb.Mineralsc.Forestsd.Water

Where in the ocean most of the oxygen is produced?Group of answer choicesabout 300 feet below the surfaceby respirationby bacterianear the surfacenear the bottom

When the Earth was first formed there was no oxygen in the atmosphere.Explain how the atmosphere changed so that today it is 21% oxygen and only 0.04% carbon dioxide.

Of the following, which is contributing the most to the amount of carbon dioxide in the atmosphere?AgricultureRespirationPhotosynthesisCombustion of fossil fuels