Describe the source of free oxygen in the earth’s early atmosphere

ability to mate mark me brainliest

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.