Why is plants the main life on earth?

Plants are the only organisms that can convert light energy into food. Plants produce all the foods that animals, including humans, eat, even meat. The animals that provide us with meat, such as chickens and cows, eat grass, oats, corn, or some other plant.

Plants make oxygen. All oxygen available to living organisms comes from plants.

Plants provide a habitat for animals. Plants are the primary habitat for thousands of other organisms. Animals live in plants or under plants. Plants provide shelter and safety for animals.