It is theoretically possible that bacteria developed

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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 ________.

(A) Whether or not bacteria actually developed on Mars.

(B) Its likely it is that Martian bacteria were transported from Earth.

(C) Martian bacteria could have been carried to Earth by means other than meteorites.

(D) All bacteria now on Earth could have arisen from transported Martian bacteria.

(E) There could have been strains of bacteria that originated on Earth and later died out.

What would be the best option to complete the passage?

OA D

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by [email protected] » Fri Mar 16, 2018 8:05 am
lheiannie07 wrote: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 ________.

(A) Whether or not bacteria actually developed on Mars.

(B) Its likely it is that Martian bacteria were transported from Earth.

(C) Martian bacteria could have been carried to Earth by means other than meteorites.

(D) All bacteria now on Earth could have arisen from transported Martian bacteria.

(E) There could have been strains of bacteria that originated on Earth and later died out.

What would be the best option to complete the passage?

OA D
The gist is that the bacteria on earth are too similar to have originated on different planets. Meaning: they all originated on one planet. So they could all have originated on Earth. Or they all could have originated on another planet and then been transported here. This is what D gives us
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