Which was the first photosynthetic organism?

The origin of life occurred in .....

According to which theory did the first living cell originate from abiotic molecules through a process of gradual evolution?

Which English scientist worked on the origin of life and later settled in India?

Who proposed the Big Bang theory?

Louis Pasteur's experiments,if you recall,proved that life can arise from only pre-existing life. Can we correct this as 'life evolves from pre-existent life',or otherwise we will never answer the question as to how the first forms of life arose? Comment.