Almost all microbe species live together in dense, interdependent communities, supporting the environment for each ot...

Brandon on October 7 at 10:45PM

please explain

Ans C was confusing b/c the prompt talks about microbe species and then specifically again says "lack complete knowledge of most microbe species", however ans C refers to "any species of organism" and organism is far broader than microbe species.

1 Reply

Mehran on October 16 at 12:16AM

@Brandon the conclusion here is, "Thus, microbiologists lack complete knowledge of most microbe species."

The support?

"Almost all microbe species live together in dense, interdependent communities, supporting the environment for each other, and regulating the population balances for their different species through a complex system of chemical signals."

"For this reason, it is currently impossible to cultivate any one such species in isolation."

This is a Strengthen with Sufficient Premise question, so we are looking for the answer choice that 100% guarantees the conclusion here.

Notice the jump in the argument. Because it is currently impossible to cultivate any one microbe species in isolation, microbiologists lack complete knowledge of most microbe species.

Now let's take a look at (C), which states:

"No microbiologist can have complete knowledge of any species of organism unless that microbiologist can cultivate that species in isolation."

This is "No As are Bs" so this sentence would be diagrammed as follows:

MCK ==> CSI
not CSI ==> not MCK

Notice that the contrapositive here closes the gap by making "impossible to cultivate any one microbe species in isolation" (not CSI) sufficient for "microbiologists lack complete knowledge" (not MCK).

As such, (C) would be the correct answer.

Hope that helps! Please let us know if you have any other questions.