Why do all living things go through cellular respiration, ie, what is the purpose of cellular respiration?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Abody cell has been growing and at synthesis proteins. in the nucleus of this body cell, dna replication is taking place. and a copy of the cells genetic material is copied. which of the following is the best conclusion you can make about the life cycle of this cell ? a) the cell is ready to undergo mitosis. and a chemical signal will send the cell to prophase b)the cell is undergoing meiosis and will cross over the genetic material next c)the cell is in the s phase of interphase and will move next to the g2 phase d) the cell is in the g2 phase of the interphase and is ready to begin diving

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil