The only life on Mars is the microbes Curiosity brought with it..
But.... some microbes may have escaped from previous missions as well..
sometime they might find some of this life and deem it indigenous.. after its “evolved”..
Who’s to say the ‘microbes’ aren’t from Earth? 65 million years ago, give or take a million or so, a huge something hit the Earth. It could have thrown up tons of dust and rock into space that drifted through space another million years or two or three or four, then finally came to rest on Mars, carrying ‘life’ from here...................