I am majoring in developmental biology at university.

I am majoring in microbiology at university.

He is an expert in paleontology.

Astrobiology is a very interesting field of study.

He is an expert in ethology, and his research is highly regarded worldwide.

He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

What is this organism?

He is a carnivorous man, being aggressive in relationships.

I saw many animals at the zoo.

It is important to understand the importance of health.