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?
Excuse me that I type in English, because I'm using school computer now. I need help~~ NN brothers and sisters, please help me on the CR as following. Thanks so much~
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 of the following criticisms?
A. It fails to establish whether bacteria actually developed on Mars. B. It fails to 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.
E说,是否起源于地球的细菌后来died out,如果是died out了,那么地球上的no two bacterial strains on Earth are different enough to have arisen on different planets就有可能都是来自火星上的细菌,因为地球自己的细菌死光了。从而就说明火星上的细菌到地球来后并没有died out,削弱了文章。