Qn no 136 of advanced CR guide of current GMAT qns
I am stuck between choice d and e. How choice d is breaking the argument and why e is incorrect I couldn’t figure out.
The argument basically states that –
no two bacterial strains on Earth are different enough –> All bacteria currently on earth originated on Earth
Negate E –
There were some strains of bacteria that originated on Earth and died out. Does not weaken the conclusion –
All bacteria currently on earth originated on Earth
Negate D –
All bacteria on Earth currently originated on Mars. (Weakens the argument).