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?

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

Which of the following elements is the most abundant in Earth's crust?Group of answer choicesCarbonIronOxygenSilicon

Which compound contains the greatest percent of oxygen by mass?Group of answer choicesSiO2 CO2SO2NO2

Which layer constitutes about 80 percent of the volume of the earth?a.Biosphereb.Crustc.Cored.Mantle

The Atmospheric Oxygen at 1.9 billion years ago, was percent that of the modern level. A- 10% B- 15% C- 70% D- 50%