Plants make their own food by photosynthesis, absorbing carbon dioxide and releasing oxygen in the presence of sunlight and chlorophyll. This single process supports almost every food chain on the planet.
Roots absorb water and minerals, stems transport them, and leaves are the site of photosynthesis. Transpiration - water loss through stomata - helps pull water up the plant.
Animals are classified as vertebrates and invertebrates. Mammals are warm-blooded and feed their young with milk; reptiles and amphibians are cold-blooded.