Biology / Unit 8 Bio 1665 short lesson, about 20 seconds
Fossil Evidence for Evolution
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The idea
The fossil record documents past organisms that differ from those living today, arranged by age to show gradual change in form over time.
In practice
Fossil hominid skulls arranged from oldest to newest show the skull's shape changing gradually across that span.
Where people slip
A fossil sequence shows the order and pattern of change — dating individual fossils' exact ages is a separate task.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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