Living or Not

The plants have grown a lot since I last checked them, and they seem to be doing okay. Plants are a living thing because they grow and produce things like oxygen. If you do not give them enough water, sunlight or soil with lots of nutrients, then they will start to limp over and eventually die. The appearance has changed a lot as well, from being a small seed into a small stem with leaves and eventually into a full grown plant. You could measure the amount of things it requires to survive over time as it gets bigger in size.