Examlex
The development of the polio vaccine would be considered a(n)_____________________ to society.
Extinction
The process through which a species ceases to exist due to the death of its last remaining members.
Dinosaurs
A diverse group of prehistoric reptiles that lived during the Mesozoic Era, now extinct.
Mass Extinctions
Events in Earth's history where large numbers of species become extinct in a relatively short period of time.
Fossil Record
The collection of all known fossils and their placement in rock formations and sedimentary layers, providing evidence of past life and evolutionary histories.
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