PLEASE I NEED HELP RN :( 1. Point out one crucial part of Earth's history were life may not have emerged if it was altered. Cite such event and explain its importance relating to how life is existing in Earth now.

2. What are the other uses of the atmosphere which is also useful in protecting life on Earth?

3. Given the sun, water and soil hypothetically and only ones present on Earth, do you think it is possible to exist life, yes or no? Support your answer.

4. Mars is being eyed to be a probable "alternative" in case life on earth would experience worst conditions. What notable evidences have they seen for Mars to provide life for humans?

5. As life is now existing on Earth, is it possible that life can be cut-off? If no, what are the causes that you think the world could sustain If yes, what events/instances can lead this planet to its end?