Which of the Following Observations Led Astronomers in the Late

question 2

Multiple Choice

Which of the following observations led astronomers in the late 1800s to suspect that there might be life on Mars?

• A)Seasonal variations in dark surface markings
• B)The observation that its atmosphere is largely oxygen
• C)The detection of liquid water on the surface of Mars
• D)Unexplained flashes of light on the night side of the planet

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