He exercises every day to maintain his physical health.

The study of chromosomes is an important part of genetics.

He has physical strength, so he can work for a long time.

The structure of the human body is very complex.

Our team is the subject of this project.

What on earth is he thinking?

This substance will change into a solid.

This liquid is very dangerous.

This medicine is made outside of the body.

Poison is spreading inside his body.