No, all of Earth's carbon dioxide supply is not constantly being used by organisms. While organisms, such as plants, algae, and some bacteria, do use carbon dioxide through the process of photosynthesis to produce energy and oxygen, there are also processes that release carbon dioxide back into the atmosphere. These processes include cellular respiration by organisms, volcanic activity, and the burning of fossil fuels by human activities. It is a natural cycle where carbon dioxide is constantly being exchanged between organisms, the atmosphere, the oceans, and the Earth's crust. However, human activities, such as the burning of fossil fuels, have significantly increased the amount of carbon dioxide in the atmosphere, leading to potential climate change.
