-- Exercise Q2) What is the difference in meaning between the original version and the following version? - 'Much as' is not a comparative form (or it is no longer one); it is an idiom meaning 'similarly, in a similar way'.
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jooneyQ1) In the original example, what exactly is the antecedent of "does"?'slow or reverse' In this configuration, do (does, did) is sometimes called a Pro-Verb (analogous to 'pronoun', a noun substitute).
jooneyQ2) What is the difference in meaning between the original version and the following version? Why was the original
jooneyhow you go from "it slows or reverses the physical decay of muscles", which is the full version to "it does with muscles". I don't understand in particular the presence of the preposition "with".An odd sort of construction, isn't it?