Autotrophs.
Green plants make food from sunlight. All animals get their food by eating plants (living things) or animals (also living things)
food web
plants
Sponges
Living things capable of processing their own food are called Autotrophs. They are living things which contain chlorophyll. So, plants are the only autotrophs.
Autotroph
produser
All living things depend on green plants for food because they are producers. They are the only organisms that are able to make their own food.
Heterotrophs
All animals eat other living things, either plants or other animals. The only living things that make their own food are plants.
producer
Autotroph!