Polar zones are cold and tend to be dry because of a pressure system of cold. low high

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.

What best explains the inability for life to exist in earth early atmosphere

Which would be the most useful source of evidence to support mcneill's contention?