Here’s the stimulus distilled:

Old Theory
dark bottom – dark shells
light bottom – light shells

New Theory
choppy water – dark shells
calm water – light shells

We’re looking for evidence to support the new theory over the old, so we can anticipate one of the following:

1. dark shells – choppy water – light bottom
2. light shells – calm water – dark bottom

It takes a lot of mental effort to keep all these moving pieces straight in your mind. If you missed this question, or if it took you a long time, the lesson is to just write a few quick notes. It’s like trying to remember a phone number or something – you can probably manage it if you actively keep repeating it to yourself, or you could just write it on a napkin it takes like 2 seconds.