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Maybe, if someday they discover life on an exoplanet, the most advanced life form will be the local version of a tardigrade.
What an amazing creature. Long after we’ve gone from this planet, they’ll still be here.
https://a-z-animals.com/blog/what-do-tardigrades-eat/
Tardigrades have been known to eat the following foods:
Algae
Moss
Flowering plants
Other plant matter
Bacteria
Rotifers
Other tardigrades
Other microorganisms
Tardigrades have a digestive system, but not a respiratory or circulatory system. They are capable of eating microorganisms and digesting them, but they thrive on liquid substances- this is also where they get their oxygen.
(More at link)
