He is an expert in astrophysics.

This factory reuses the byproducts produced during the manufacturing process.

A tardigrade can survive in extreme environments.

Ruminants have the characteristic of re-chewing food after swallowing it once.

He is an expert in theoretical physics.

My pet is a dog.

In marine biology, plankton is an important part of the marine ecosystem.

He is very interested in paleontology.

I am majoring in biochemistry at university.

I am majoring in Biochemistry at university.