NASA's Curiosity rover sent back some rather curious photos of what appears to be some kind of fungi:
(Apologies for the not-so-reputable source.)
Source: Mars rover 'takes photos of mushrooms growing on surface of Red Planet' (25. March 2019)Dr Regina Dass, a microbiologist from Pondicherry University in India, argued that no known, non-living force could have produced the apparent growths.
(Apologies for the not-so-reputable source.)