Carbon dioxide is used by plants to form glucose, which is like special food that plants make for themselves using light energy from the sun, water, and carbon dioxide (CO2). They get this carbon dioxide from organisms that use respiration instead of photosynthesis. During respiration, cells take in oxygen, and CO2 is left as an end product. The plants then use this carbon dioxide during photosynthesis with an end product of oxygen. It goes on and on in a never ending carbon cycle. Without plants there would be no animals, and if their were too many plants or too many animals that wouldn't work in a food chain either. Sorry if THAT doesn't answer your question. :)
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Food energy, which is a type of chemical energy.
The term used to describe food chains that overlap and intersect is called a food web. A food web consists of multiple food chains in an ecosystem.
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A food web consists of several components; primary producers, primary consumers, secondary consumers, tertiary consumers, and so on.
Birds have an interesting food web that they are right in the middle of. Depending on the type of bird you are thinking of they may or may not have other birds that are considered their predators. They usually eat seeds, worms, and if they are predatory possibly other birds.