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 has intelligent life?

Question

Quizplus · Accepted Answer

Based on our understanding of Earth's evolution, we only have evidence of the existence of intelligent life on our planet. We do not have any conclusive evidence of the existence of other intelligent life forms on other planets. Therefore, until we have concrete evidence of the existence of extraterrestrial intelligent life forms, the most reasonable assumption would be that the percentage is 0 percent.

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