31.   If the amino acids were from Martian life, he said, then they should have been different from amino acids on Earth.

32.   If there was Martian life, it probably never evolved beyond micro-organisms, and then died out.

33.   Meanwhile, a visiting NASA scientist mourned the loss of the probe as a setback for the search for Martian life.

34.   Scientists hope to identify areas such as dry river valleys where fossilized Martian life might be found so they can set landers down.

35.   Some scientists theorize that lakes and seas may have sustained martian life.