OK, **IF** it is possible that ejecta from Mars made it to earth (and I see that as REMOTE) HOW can one establish that this particular piece of ejecta/meteorite came from MARS since there is no other sample to confirm/compare/verify? That this meteorite came from MARS is pure speculation, not science.
Doesn’t mean it’s not possible. But come on.
Also if ejecta from MARS could make it to earth, then the reverse is also true. Perhaps early life from earth colonized early MARS via ejecta. A plausible pan-spermism theory if you like those.
Clearly, the science is settled, so why do we continue the discussions?
The Viking Mission to Mars back in the 70s conducted remote tests on rocks there and did an isotope analysis. Some meteorites on Earth match up identically to them chemically. It is like a DNA match.
In addition, what is the likelihood that these meteorites, if they really are from Mars, happened to be ejecta from near the surface where life would presumable be? Any event large enough to blow pieces of Mars away at velocities in excess of escape velocity would consist almost entirely of interior material and a minuscule proportion that was close to the surface. This "science" appears to be little more than a convenient fund raising trick to appropriate more tax money.