Thanks a Million GMAT Club for putting this wonderful piece together! I can imagine the kind of efforts that may have gone into making this.
I have a minor observation relating to CR question 555. There is a mismatch in the correct answer given in the link and that given in OG 2017.
In OG 2017, the correct answer is - "C. The main predator of these fish is another species of fish on which alligators also prey". In the link, the correct answer is - "D. During Parland’s dry season, holes dug by alligators remain filled with water long enough to provide a safe place for the eggs of this fish species to hatch."
Though this minor change is not a big deal, I still thought of reporting it any which ways