The Sun!
Because when you eat you get energy and a food chain tells you which animal eats what
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All of your energy come from the food you eat.
All energy begins with the sun. It is absorbed by plants.
They all have a flow of energy. The amount of energy available decreases as the food chain increases.
If you have a food chain then the chain must have a beginning (where the food is made) and an end (where the food is finally all used up). Thius in a food chain the "producers" of the food (the plants) are ALWAYS the start. The plants make food using CO2 from the air, Water from the ground and the energy they collect from Sunlight. It is the passing on of this energy from the Sun that is the chain.
The food chain connects all the energy of animals to the greatest to the least and the food web still shows all the energy and they both contains nature,water,soil,air,weather,and plants
Decrease in higher levels.
the midlle
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The energy in an energy pyramid initially comes from the sun through the process of photosynthesis carried out by plants. This energy is then transferred up the pyramid as organisms consume other organisms in the food chain.
A producer is at the beginning of every food chain. Usually it is a green plant, which can use the energy in sunlight to produce food. That food supports all the other organisms. There is no food chain until food is produced.