The correct answer is option 1: Bacteria. Biodegradable wastes are organic materials that can be broken down and decomposed by living organisms. Bacteria are microorganisms that play a crucial role in the decomposition process. They have enzymes that can break down complex organic compounds into simpler substances. These simpler substances can then be used by other organisms or undergo further processes to be converted into useful substances.
Option 2: Nuclear proteins are not involved in the decomposition of biodegradable wastes. Nuclear proteins are involved in various cellular processes and functions within the nucleus of cells.
Option 3: Radioactive substances are not involved in the decomposition of biodegradable wastes. Radioactive substances emit ionizing radiation and have different properties and effects.
Option 4: Viruses are not involved in the decomposition of biodegradable wastes. Viruses are parasitic infectious agents that are specific to certain host organisms and do not have the ability to break down organic materials.
Therefore, the correct answer is option 1: Bacteria.