Biology

The correct answer is Hypothesis.

Explanation:

A.Hypothesis: A hypothesis is a proposed explanation or prediction that can be tested through experiments or observations. The statement "Humans will live on Mars after 50 years" is a prediction about the future, which makes it a hypothesis. It is testable, in the sense that it could be verified or refuted in the future based on evidence or advancements in technology and space exploration.

B.Theory: A theory is a well-substantiated explanation of a phenomenon, supported by a large body of evidence. The statement about humans living on Mars is not an explanation for a known phenomenon, but rather a future prediction. Therefore, it ...