Which gas do animals release as a waste product?
From the atmosphere, and also as a waste product exhaled by animals during respiration. The Earth's atmosphere consists of 0.04% Carbon Dioxide, and it is exhaled by all mammals as a waste product. Animals and plants need each other, as what is waste gas to the one, is essential for the other to live.
Explain how the waste products of nuclear fusion reactions are different from the waste product of nuclear fission reactions?
Oxygen is one of the products that is produced by plants during photosynthesis. It is not a waste product. During aerobic cellular respiration, both plant and animals, and other types of organisms, consume oxygen and glucose, and produce carbon dioxide and water. Photosynthesis is responsible for 98% of the oxygen in the earth's atmosphere.
Animals need a gas exchange system so they can expel Carbon Dioxide (a waste product) from their body and replenish it with Oxygen. This gas exchange allows them to gain the energy they need to function. Oxygen enters the mitochondria of a cell and breaks down glucose, which releases energy used to make ATP, the substance that provides energy for most metabolic processes in animals. Hope this helps!