His red hair is thought to be an atavism.

He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

I am majoring in microbiology at university.

Astrobiology is a very interesting field of study.

He is an expert in paleontology.

He is an expert in aerobiology, engaged in the study of microorganisms in the atmosphere.

He is an expert in biophysics.

Molecular biology is a field of study that understands life phenomena at the molecular level.