The first level
the producer.
Chemical bonds are broken to supply us with energy. Without bonds, and our ability to break them, the food we eat would not supply us with energy.
It supports energy for more organisms so they can survive.
It is required to supply chemical energy, organic molecules, and essential nutrients
The sun
An organism that uses energy to produce its own food supply from inorganic compounds is called an autotroph (within a food chain, it is a producer).
The bottom level which contains plants has the most energy. This is because they get their energy directly from the sun while other animals get it from plants themselves, or other animals. Animals cannot absorb 100% of the energy when they eat plants so the level of energy degrades all the way to the top of the food chain. Each animal gets less and less % of the energy the plant had in the first place.
they die
the nutrients in the food supply the body with energy
an energy pyramid
Producers
digestion of food and burning of its energy.