Is it though? Isn't our scientists' classification of life limited to what we have on Earth? What if there is even tinnier or other form of life on Mars? I am m

Is it though? Isn't our scientists' classification of life limited to what we have on Earth? What if there is even tinnier or other form of life on Mars? I am mostly asking because we already know of extremely small bacteria being able to survive after 32,000 years in ice on Earth. So what if something similar is there on Mars too?