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Comments

I’m a little confused as to why 18. Is not D. The explanation of the mouse being used is what led me to choice D. I am struggling with E being the right answer.

Lines 9--20 indicate that some nerve cells die before they do anything (that may be even clearer if you consider those lines along with 51--59).
For (D) to be correct, the passage would have to say that nerve cells get converted to other tissue types. That's your fallback always; the right answer has to be there in the passage.

Is question 18 similar to an inference question in LR in the sense that you would expect the correct answer to have small language? Thanks

Also, for question 18, why is answer choice C incorrect?

(C) is incorrect because it appears to be directly contradicted by the passage; at the end of the final paragraph, the passage says that NGF directs the nerve cells to the targets where they must connect!
Clearer?