Phosphorous is:

A:found free in the atmosphere

B: returned to the soil by rhizobium

C: added to the soil though weathering

D: usually very abundant in an ecosystem

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy

What best describes the dropping height of a ball that bounces back up to a height of 45 cm

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