He values his private life.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

Microorganisms are one of the basic forms of life.

Protists are single-celled organisms that live in water.

I love biology.

I am majoring in biology at university.

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