What makes a planet living comparing earth and mars

" Earth is a living planet because it contains organisms. Life exists on Earth on the land, in the water, in the atmosphere. An organism that uses solar or chemical energy to produce "food" by making inorganic compounds into complex organic molecules. " (Quizlet)

Hope this helps

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for