In ancient times ____________were the largest forms of life on earth.

Reptiles grew to immense sizes and dominated the earth.

The Mesozoic Era started about 252__________years ago.

During the Mesozoic period the land masses were almost completely merged. This is called________________.

Scientists found that the __________ of the Archosaurs were much lighter than reptile ancestors.

Early dinosaurs had many things in common such as a long neck, a__________tail and reptilian body.

Around 201 million years ago Pangea began to ______________.

The result of Pangea breaking apart caused the End-Triassic Mass Extinction.

After the Mesozoic Era came the Jurassic Era.

Many mammals ___________during this period.

The third Era is called the Cretaceous Era.

During the Cretaceous Era; about 130 million years ago the first_____________________ occured on earth.

Logs dated from 66 million years ago showed massive_______________ that lasted hundreds of thousands of years

Around 66 million years ago a giant asteroid hit the Gulf of Mexico that created an “impact winter” that starved all plant and plankton life.

These events brought forth the extinction of ___________percent of the world's species.

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