Although the biosphere measures about 20 kilometers (12 miles) from top to bottom, almost all life exists between about 500 meters (1,640 feet) below the ocean's surface to about 6 kilometers (3.75 miles) above sea level.
the center of the solar system is the sun
You need to test the hypothesis several times and record all results. Once you obtain the same results several times, I think that means its a theory
