Based on what you know of the Earth's evolution, what percent of Earth-like planets in a star cluster with an age of 2 billion years likely has intelligent life?
A) 0
B) 10 percent
C) 30 percent
D) 50 percent
E) 100 percent

Question

Quizplus · Accepted Answer

While the development of life on Earth may give us some idea of the conditions necessary for life to arise, we cannot say with certainty that these conditions exist on other Earth-like planets. Even if conditions are similar, the development of intelligent life may be highly unlikely and subject to numerous factors outside of our knowledge at this time. Therefore, it is safest to assume that the vast majority of Earth-like planets in a star cluster with an age of 2 billion years do not have intelligent life.

Based on What You Know of the Earth's Evolution, What