Final answer:
Topics such as Ecology and Genetics are studied by biologists, while Astronomy and Economics are subjects outside of biology.
Step-by-step explanation:
The two topics likely to be studied by biologists are Ecology and Genetics, while outside the realm of biology, two areas could be Astronomy and Economics. Biologists study a wide range of life sciences, which includes branches like cell biology, which looks at cellular structure and function, and genetics, the study of heredity and gene transmission. Meanwhile, ecology is concerned with the interactions between organisms and their environment.
These are just a few areas within the diverse field of biology, which also includes molecular biology, botany, microbiology, zoology, evolution, and physiology. Astronomers, on the other hand, study celestial objects and the universe, which is a physical science outside of biology's focus on living organisms. Economists analyze the production, distribution, and consumption of goods and services, which is part of the social sciences, thus it's not directly related to biological studies.