He is devoted to the study of neoplasms.

My biological clock is disrupted, and I've been having sleepless nights.

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.

He is learning Ancient Greek language.

His words were like water off a duck's back to her.

He is a frog in a well, not understanding how vast the world is.

The cane toad is causing a big problem in Australia.