food chain
A food chain is an idea developed by a scientist named Charles Elton in 1927. He described the way plants get energy from sunlight, plant-eating animals get their energy from eating plants, and meat-eating animals get their energy from eating other animals. The idea of a chain means that all these animals are linked together, so anything that affects one link in the chain affects everything in the chain. ]The key concept that we need to learn from food chains, food webs and food pyramids is the transfer of energy. For all life on earth there is only one available source of energy, the sun. Furthermore, only plants can change this energy into a form that can be used by animals. All plants rely either directly or indirectly on plants for their energy. Plants feed upon sunlight. Only plants have the ability to convert sunlight into food that they and animals can use. Feeding levels are also called trophic levels. The word "trophic" is a Greek word for nourishment. To determine the trophic level, we count the number of energy transfers. Green plants are at the first trophic, or nourishment, level because there has been one transfer of energy, from the sun to the plants.The first link in the chain, the plant, is called the produ
Then the rabbits have less food and some of them will die. Of course, in the real world, there are no simple food chains like this. Once produced, these compounds can be used to create the various types of plant tissues. Primary consumers or herbivores form the second link in the grazing food chain. Organisms involved in fermentation include bacteria and yeast. Everything once living or alive will be consumed by decomposers at some time and returned to inorganic form. The amount of material consumed per day is often equal to their body weight. Then because there are fewer rabbits, some of the foxes will die, too, even though they don't eat the grass directly. Respiration is so much more efficient at releasing the energy contained in organic molecules therefore the activity of the detritus food chain is much higher in an aerobic environment, and the breakdown of materials more complete. Consumers lose significant amounts of consumed energy due to assimilation inefficiencies, morphological and physiological maintenance, reproduction, and the process of finding and capturing food. For most ecosystems the model begins with the photosynthetic fixation of light, carbon dioxide, and water by plant autotrophs or primary producers who make sugars and other organic molecules. Organic matter breakdown is substantially slower and less complete in anaerobic environments. They gain their energy by consuming primary producers. Normally, ecosystems have about four or five trophic levels. Eventually, rain washed it into rivers and lakes, where the concentration was still very small, but this is where the food chain took effect.
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,
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