Biotechnology plays a very important role in the medical field.

He is devoted to the study of neoplasms.

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

Keiko is my best friend.

His behavior was not suitable for his position.

He learned the style of the painting to imitate the ancient artist.

I am majoring in microbiology at university.

I am majoring in microbiology at university.

He is an expert in paleontology.

Astrobiology is a very interesting field of study.