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Given Earth's Evolutionary Timeline, What Percent of Earth-Like Planets in a 2

Question 21

Multiple Choice

Given Earth's evolutionary timeline, what percent of Earth-like planets in a 2 billion-year-old star cluster can be estimated to host intelligent life?


A) 0 percent
B) 10 percent
C) 30 percent
D) 50 percent
E) 100 percent

Correct Answer:

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