Biology of PlantsHeidi ReinaJanuary 8, 2010Plants From site: Plants are alive, just like people and animals. How do we know this? Living things all do certain things: They grow and die. They need energy, nutrients, air, and water. They produce young. They are made up of cells. They react to what’s around them. Previous Post Secret Life of the Brain Next Post Lizards & Snakes Alive