plants and animals are linked to each other in the carbon dioxide and oxygen cycle.planta make those own food through a process called photosynthesis. and in the process produces glucose that is used during cellular respiration and oxygen. plants produce oxygen as a waste product.the process of photosynthesis relies on carbon dioxide. animals on the other hand breathe in oxygen and breathe out carbon dioxide as a waste product and water too. so animals need plants and plants need animals
