Which of the following terms means "life" or "living"?

The term that means "life" or "living" is indeed the prefix "Bio." It derives from the Greek word "bios," which translates to life. This prefix is widely used in various scientific fields to indicate a relationship to living organisms, such as in words like biology (the study of life), biodegradable (capable of being decomposed by living organisms), and biochemistry (the study of chemical processes in living organisms). This foundational meaning underscores the significance of life-related studies and practices in agriculture and biology.

The other options, while related to life forms and biological processes, do not specifically denote the concept of "life." For instance, "Gene" refers to the basic unit of heredity in living organisms, "Cell" is the structural and functional unit of all living things, and "Organism" refers to an individual living entity. Each has its own specific context in biological discussions, contributing to understanding life but not directly signifying the concept of life itself like "Bio" does.