Megatsunami swept over Mars after massive asteroid hit the Red Planet

Yes, an enormous amount of liquid, rocks and dirt would have been blasted into space. The water would have vaporized, probably killing most of whatever microbes might have been there. However, microbes can survive a long time deep inside a rock in outer space. There is no doubt in my mind that transfers of life, if it existed, were fairly common between the rocky planets.
The paper cited does says this about life on Mars. "Consequently, the V1L soil salt compositions72 could hold information connected to Mars' Late Hesperian northern ocean. For example, cold brine chemistry modeling work of such salt assemblages suggests that the ocean was likely a Mg–Na–Ca–Fe2+–SO4–Cl–CO3–Br-rich brine75,78. This solution type is unlike Earth's seawater but like some hypersaline continental brines79,80. Their sulfate saturation at ocean temperatures between the mid-260s and low-270s K75,80 could have potentially supported life. For example, on Earth, some hypersaline brines with halotolerant taxa are known81,82."

Okay, a global Flood on Mars :) and an ocean that *potentially supported life*. This report says a Martian meteorite that was claimed to show life on Mars - failed mission.

Study nixes Mars life in meteorite found in Antarctica,

Reference paper, Organic synthesis associated with serpentinization and carbonation on early Mars,, 13-Jan-2022. "Abiotic formation of organic molecules Mars rovers have found complex organic molecules in the ancient rocks exposed on the planet’s surface and methane in the modern atmosphere. It is unclear what processes produced these organics, with proposals including both biotic and abiotic sources. Steele et al. analyzed the nanoscale mineralogy of the Mars meteorite ALH 84001 and found evidence of organic synthesis driven by serpentinization and carbonation reactions that occurred during the aqueous alteration of basalt rock by hydrothermal fluids. The results demonstrate that abiotic production of organic molecules operated on Mars 4 billion years ago. —KTS"

So far, no solid observation(s) showing life on Mars today or in the past. Necessary demonstration in nature is required, just like the heliocentric solar system model had to provide to be accepted over the geocentric model.
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