The secret to longevity is having healthy internal organs.

This castle was constructed in the 16th century.

He is planning to construct a new house.

Old Church Slavonic is the oldest recorded language of the Slavic group.

Old Church Slavonic is the first language written by the Slavs.

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.

He is majoring in zoology at university.

I love biology.