His service record is very excellent.

He is active as the chief information officer of our company.

The Paleolithic is the first era of human history.

This mineral is called ulexite and has special optical properties.

The Neolithic was an important period in human history.

As the name suggests, chordates are a group of animals that have a notochord.

The spinal reflex is a part of our body that reacts automatically.

He is strong like a stone.

My uncle is a famous zoologist.

He is an expert in astrophysics.