Q40 it is theoretically possible that bacteria

Q40:
It is theoretically possible that bacteria developed on Mars early in its history and that
some were carried to Earth by a meteorite. However, strains of bacteria from different
planets would probably have substantial differences in protein structure that would persist
over time, and no two bacterial strains on Earth are different enough to have arisen on
different planets. So, even if bacteria did arrive on Earth from Mars, they must have died
out.
The argument is most vulnerable to which of the following criticisms?
A. It fails to establish whether bacteria actually developed on Mars.
B. It fails to establish how likely it is that Martian bacteria were transported to Earth.
C. It fails to consider whether there were means other than meteorites by which
Martian bacteria could have been carried to Earth.
D. It fails to consider whether all bacteria now on Earth could have arisen from
transported Martian bacteria.
E. It fails to consider whether there could have been strains of bacteria that
originated on Earth and later died out.
Answer:
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Q41:
The greatest road system built in the Americas prior to the arrival of Christopher
Columbus was the Incan highway, which, over 2,500 miles long and extending from
northern Ecuador through Peru to Southern Chile.
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