He is known as a person with learning.

Taxonomy is the science of finding, understanding, and naming species of organisms.

I love biology.

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.