Biology: The study of life and living organisms.
Biochemistry: The study of chemical processes within and relating to living organisms.
Biophysics: The study of physical principles applied to biological systems.
Biotechnology: The use of living organisms or their components to produce products or processes.
Bioethics: The ethical implications of biological research and applications.
Biofeedback: A technique that allows people to monitor and control their physiological responses.
Biofuel: Fuel derived from biological sources.
Biodegradable: Capable of being broken down by living organisms.
Biodiversity: The variety of life on Earth.
Biopsy: The removal and examination of tissue for diagnostic purposes.
Biohazard: A biological substance that poses a risk to human health.
Biome: A large, naturally occurring community of flora and fauna occupying a major habitat.
Biomechanics: The study of the mechanics of living organisms.
Biometry: The application of statistical methods to biological data.
Bioinformatics: The use of computer science to analyze biological data.
Biostratigraphy: The study of fossils and their distribution in rock layers.
Biotechnology: The use of living organisms or their components to produce products or processes.
Bioterrorism: The intentional release of biological agents to cause harm.
Bioweapon: A biological agent used as a weapon.
Biogeochemistry: The study of the chemical and physical processes that occur between living organisms and their environment.
Biomimicry: The design of materials and systems inspired by biological processes.
Biosphere: The part of Earth that supports life.
Bioaccumulation: The increasing concentration of a substance in organisms as it moves up the food chain.
Biomagnification: The process by which the concentration of a substance increases in organisms as it moves up the food chain.
Biosynthesis: The production of complex molecules from simpler ones by living organisms.
This is not an exhaustive list, but it gives you a good starting point. You can also find many more words with the root "bio" by looking up dictionaries and thesauruses online.