Difficulty: Medium
Average Score: 74%
First, the Moon's gravity is less than 17 percent of Earth's gravity, which is too low for sustained human existence. Secondly, the lack of an appreciable atmosphere on the Moon leads to temperature extremes. Depending on where the Sun is shining, temperatures can be too hot or too cold for humans. Lastly, the Moon lacks elements such as nitrogen and carbon that are necessary for breathable air and water.

The fact that Toni signed Leo up “even though he didn't have kids” implies that she ______.

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