He is traveling around the world as an ecologist.

He is a renowned criminologist who has contributed to many crime analyses.

The seismologist is studying earthquake prediction and disaster prevention.

He is a world-renowned zoologist.

He is a renowned economist who has written many important papers.

He is world-famous as an entomologist.

He likes to take a walk in the park at dusk.

New World monkeys live in South America.

The World Health Organization is working to improve public health worldwide.

The World Trade Organization is an important organization that sets the rules for international trade.