He proposed a new hypothesis about the problem.

I like finding fossils.

This tree has fossilized over thousands of years.

This shirt is made of synthetic fibers, making it very easy to wash.

This makeshift bridge was built immediately after the flood.

This hypothesis is based on scientific evidence.

This bridge is made of makeshift.

This industry has become an oligopoly.

People in the old days liked to eat sea urchins.

He started dieting because he was concerned about his fatness.