See what we can offer to your school
"SimpleStudy just makes sense...”
Get the best plan for your school
10 questions from this quiz
3.8 billion years ago
Released oxygen into atmosphere
Hard body parts fossilize better
Rapid burial by sediment
High oxygen availability
Closer to the surface
Long geological existence
Traits of ancestral & descendant groups
Time for half the radioisotope to decay
Very little C-14 remains to measure
Select your subjects, and get access to A+ resources today.