His nature is very kind.

He decided to undergo sex reassignment surgery.

The rights of transgender people should be respected.

Microorganisms are one of the basic forms of life.

Protists are single-celled organisms that live in water.

I am majoring in biology at university.

He is a world-renowned biologist.

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.