Traces of Extinct Life on Mars?

We're probably only goig o be able to find a signs of extinct life, past life, right on the martian surface. How would how wod be? No was previous life on mars, tat has existed and is no longer there? What t ona spit? But odder on, will probably only be finding, and as we're first searching wol pobonly be nding, traces of long since dead life.