ACT Preparation / Unit 21 ACT 2017 short lesson, about 20 seconds
What Each Viewpoint Explains
Captions available
The idea
Each viewpoint explains some observations and may struggle with others; matching the data to the views that can account for it shows each view's strengths.
In practice
Low oxygen explains why bottom-feeding fish died first; a heat spike explains why shallow-water fish died too.
Where people slip
A viewpoint is not weakened by data it never claimed to explain, only by data it predicts wrongly.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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