The pyramid starts with producers, which have the most energy, then primary consumers eat the plants. Then secondary consumers eat the primary consumers. Top level consumers eat the secondary consumers, then decomposers start the process over again. As the pyramid gets higher, there is less energy between levels.
The brain is the body's control centre: it sends messages to your body through a network of nerves called “the nervous system”, which controls your muscles, so that you can walk, run and move around.
