By Isobel Williams & Paul Byrne Scientists say an ancient lake bed could prove there was life on Mars. The Mars Perseverance rover has confirmed the Jezero crater was at one point filled with water. And sediments found in the crater may provide evidence of life forms. Prof David Paige from the University of California said: “From orbit we can see a bunch of different deposits, but we can’t tell for sure if what we’re seeing is their original state, or if we’re seeing the conclusion of a long geological story. To tell how these things formed, we need to see below the surface.” The rover, which …