@LeaHonorat I understand that this is a weakening question and therefore we are just trying to weaken the causal chain and make the conclusion less likely to be true but I still wonder why this is a reasonable assumption to make

How do I know that it is reasonable to assume that what is true for "relatively high rainfall" is also true for "heavy rainfall"? Maybe relatively high rainfall is not strong enough to trigger long periods of sustained rain but heavy rainfall will?

I understand why E is wrong, but I don't understand why J.Y is saying in the video explanation that E is strengthening the argument since the argument suggests that if anything the effect goes away with age. In E, they are the oldest of all of the studies, and still experience nearsightedness.

Got confused by the fact that the lesson on Shallow Dip suggests that "A is typically B" also means "most As are Bs". But I guess the trick here is that to typically be something and to typically have isn't the same? This would be why we can't assume that because X typically has Y then most X have Y? Would love some clarification nevertheless.