Question: please Which two statements explain why oxygen is vital to sustaining a healthy ecosystem? (_) A. All of Earth's heterotrophs depend on oxygen as a

please

Which two statements explain why oxygen is vital to sustaining a healthy ecosystem? (_) A. All of Earth's heterotrophs depend on oxygen as a source of energy for life processes. (-} B. Atoms of oxygen are part of the biomolecules that make up all living things. (_) C. Oxygen is a reactant in cellular respiration, which supplies energy for life processes. (_] D. Oxygen gas is needed for the combustion reactions that release energy from fossil fuels

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