We are growing vegetables without using chemical fertilizers.

Oxygen, which is one of the chemical elements, is necessary for us to breathe.

Understanding chemical equilibrium is very important in understanding chemical reactions.

This substance undergoes a chemical change when heat is applied.

In this experiment, you can observe a chemical reaction.

There are only inanimate objects in this room.

The use of bioweapons is prohibited by international law.

The study of nekton is an important part of marine biology.

I love biology.

Protecting the biosphere is important for the future of the Earth.