PrepTest 90+, Section 2, Question 21
A geologist recently claimed to have discovered in clay a previously unknown form of life: "nanobes," one-tenth the size of the smallest known bacteria. However, it is unlikely that nanobes truly are living things. They are probably inanimate artifacts of the clay's microscopic structure, because a nanobe is too small to contain a reproductive mechanism, a prerequisite for life.
A geologist recently claimed to have discovered in clay a previously unknown form of life: "nanobes," one-tenth the size of the smallest known bacteria. However, it is unlikely that nanobes truly are living things. They are probably inanimate artifacts of the clay's microscopic structure, because a nanobe is too small to contain a reproductive mechanism, a prerequisite for life.
A geologist recently claimed to have discovered in clay a previously unknown form of life: "nanobes," one-tenth the size of the smallest known bacteria. However, it is unlikely that nanobes truly are living things. They are probably inanimate artifacts of the clay's microscopic structure, because a nanobe is too small to contain a reproductive mechanism, a prerequisite for life.
A geologist recently claimed to have discovered in clay a previously unknown form of life: "nanobes," one-tenth the size of the smallest known bacteria. However, it is unlikely that nanobes truly are living things. They are probably inanimate artifacts of the clay's microscopic structure, because a nanobe is too small to contain a reproductive mechanism, a prerequisite for life.
Which one of the following, if true, most seriously weakens the argument?
No known form of bacteria is complicated enough in structure to engage in a sexual type of reproduction.
Single-celled creatures can combine to form a multicelled structure and then reproduce before they disband into separate single cells again.
The material phenomena that some scientists claim are the fossilized remains of bacteria in meteorites from Mars are approximately the same size as nanobes.
Previous definitions of life were based on research done with inferior microscopes no longer in use.
Animals such as cold-blooded lizards can be physiologically simpler, though still larger, than other animals.
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