My pet is a dog.

The study of organic compounds is an important field in chemistry.

He believes in zoolatry and lives a life in harmony with nature.

She has zoophobia, so she can't go to the zoo.

Despite their simple body structure, nematodes have surprisingly complex ecosystems.

Infrared astronomy plays a very important role in the study of the universe.

He is an expert in astrophysics.

He is interested in phrenology.

I am majoring in parasitology at university.

He is an expert in parasitology and conducts many researches.