According to scientific data, when did life on earth begin? Please support your response
The oldest direct traces of life on earth date back 3.4 to 3.5 billion years. In rocks of that age in Australia
and Southern Africa, geologists have found stromatolites, layered structures created through the activity
of primitive algae and bacteria. Other Australian rocks of similar age provide even more direct evidence
of ancient life. Sections of these rocks, known as cherts, show fossilized remains of blue-green algae.
Rocks also reveal even more distant, indirect traces of life. Living things use particular isotopes (atomic
forms) of the element carbon preferentially. The mix of carbon isotopes detected in rocks from Greenland
more than 3.8 billion years ago shows evidence of life on earth.
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Which of the following is inflammation of the pleural membranes?
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