Question

what exits the environment in the form of heat? protons energy oxygen

Explanation:

Protons are subatomic particles and do not exit the environment as heat. Oxygen is a gas and its movement or exit is not in the form of heat. Energy, especially in biological or physical systems, is often dissipated from the environment in the form of heat (e.g., in metabolic processes or energy transfers, some energy is lost as heat).

Answer:

B. energy