[Pontiac]

We already know that Martian rock could have harbored primitive life forms despite reentry into the Earth's atmosphere.

We have meteors that it is theorized came from Mars.

These meteors have formations that resemble fossilized bacteria.

Even if the formations in the rock are bacteria from Mars it is certainly possible that the bacteria was fossilized prior to leaving Mars or that the fossils formed from bacteria killed in space or on entry in to Earth atmosphere.

It is also possible since we know that bacteria here on Earth live inside of rocks that the formations are bacteria that entered the rocks after the rock came to Earth. (I really don't think this one is likely since the rock fell in Antartica but it is possible)

[WhiskeyX]

Which other bodies in the Solar System have a lithosphere and atmosphere whose isotopic composition are virtually identical to Mars and the SNC group of meteorites?

[WhiskeyX]

Which other bodies in the Solar System have a lithosphere and atmosphere whose isotopic composition are virtually identical to Mars and the SNC group of meteorites?

[UCANSEE2]

These meteors have formations that resemble fossilized bacteria.

Bacteria are everywhere. Viruses too. They are a major and primary component for all life in the Universe. They are both really tough, and can survive anywhere. Viruses are dead anyway, until they find food.