Why is it so that life on the earth can not exit without plants
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This is one place on Earth where no life can exist
By Ashley Strickland, CNN
Updated 2147 GMT (0547 HKT) November 22, 2019

Ethiopia's geothermal field Dallol is full of acidic, salty and hot ponds that don't allow life to form.
(CNN)Life exists in extreme environments on Earth, from arid deserts and frozen tundras to thermal, toxic vents in the deepest reaches of the ocean floor. But it can't exist on every inch of the planet and scientists have discovered a place in Ethiopia where life can't find a way, according to a new study.
In contrast with previous research, scientists conducted multiple tests and found that there is no life, not even microorganisms, in Dallol. One of Earth's most extreme environments, Dallol is incredibly hot, salty and acidic. Its ponds extend across a volcanic crater, in the Ethiopian Danakil depression, filled with salt, toxic gases and boiling water in response to extreme hydrothermal activity.
Even in winter, daytime temperatures can exceed 113 degrees Fahrenheit. Some of the hyper acidic and saline pools have negative pH values.
The findings published Friday in the journal Nature Ecology & Evolution.

What makes a planet potentially habitable
"After analysing many more samples than in previous works, with adequate controls so as not to contaminate them and a well-calibrated methodology, we have verified that there's no microbial life in these salty, hot and hyperacid pools or in the adjacent magnesium-rich brine lakes," said Purificación López García, study author and biologist at the French National Centre for Scientific Research.
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Answer:
green plants releases oxygen, and without oxygen we can't live.