Read the following statements and choose the following option: 1. Early Greek thinkers thought units of life called spores were transferred to different planets including earth 2. Alfred Wallace by careful experimentation demonstrated that life comes only from pre-existing life 3. Oparin of Russia and Haldane of England proposed that the first form of life could have come from pre-existing non-living inorganic molecu

Step-by-step solution

Early Greek thinkers thought units of life called spores were transferred to different planets including earth. ‘Panspermia’ is still a favourite idea for some astronomers. For a long time it was also believed that life came out of decaying and rotting matter like straw, mud, etc. This was the theory of spontaneous generation. Louis Pasteur by careful experimentation demonstrated that life comes only from pre-existing life. He showed that in pre-sterilised flasks, life did not come from killed yeast while in anothe