He is an expert in computational linguistics and is involved in the development of artificial intelligence.

I have been to Bulgaria.

Coelenterates are said to be the first animals with a true body cavity.

This area is affected by radioactive fallout from past nuclear tests.

Protists are being studied in a branch of biology.

Arthropods are a large group of animals that include insects, spiders, shrimp, and crabs.

Carbohydrates are important as a source of energy.

The ejecta from volcanoes help to elucidate the geological history of the Earth.

In chemistry class, I learned about basic oxides.

In chemistry class, I learned about acidic oxides.