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The clear command

The Cretaceous seas were full of microscopic organisms such as Coccolithophores. Some  became fantastic deposits of chalk. Where can you find evidence of their existence?

This is the medium Michelangelo used to paint the Sistene Chapel ceiling.

Watercolor is a medium that is usually applied  . . .

If you go from 2B to a 6B in a graphite pencil, the graphite gets;

What dinosaur paleontologist first described dinosaurs as active, social and complex animals?

The combining form (CF) cyt/o means

Define a medical word by first defining the

The CF lith/o means

The combining form (CF) blephar/o means