Before revision: They usually specialize in a particular branch (e.g., molecular biology, zoology, botany, Ecology , hydrobiology, ethnobioloy, ethology, microbiology, anthropology, evolutionary biology, hygiene and prophylaxis) of biology and have a specific research focus (e.g., studying malaria or cancer).
After revision: They usually specialize in a particular branch (e.g., molecular biology, zoology, botany, ecology , hydrobiology, ethnobioloy, ethology, microbiology, anthropology, evolutionary biology, hygiene and prophylaxis) of biology and have a specific research focus (e.g., studying malaria or cancer).