Hi,
I also pick the wrong one and realize my mistake later.
The underline portion refers to " a microbe".
amicrobe[never before seen on Earth] that might escape from the laboratoryand it would kill vast numbers of humans who would have no natural defenses against it.
The above noun phrase is a noun modifier of "an “Andromeda strain".Here,the parallelism comes into play;a microbe that might escape and (that might) kill.
Notice that there is no comma before "and".Hence,the subject
...
I also pick the wrong one and realize my mistake later.
The underline portion refers to " a microbe".
amicrobe
The above noun phrase is a noun modifier of "an “Andromeda strain".Here,the parallelism comes into play;a microbe that might escape and (that might) kill.
Notice that there is no comma before "and".Hence,the subject
...
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