The correct answer is C.
The cyanobacteria hypothesis is a leading theory for how O2 was made prevalent.
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Is an organism in its earliest stage of development. In humans, this is the stuff and defined as the developing organism from the fourth day after fertilization to end of the week. After that unborn baby is usually referred to as the fetus.
Answer: Clearcut
A Technique that removes all the trees regardless of size of an area in one operation
