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A food web consists of all the food chain s in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrient s may take as they move through the ecosystem. All of the interconnected and overlapping food chains in an ecosystem make up a food web. Trophic Levels Organisms in food webs are grouped into categories called trophic level s. Roughly speaking, these levels are divided into producer s first trophic level , consumer s, and decomposer s last trophic level.
Mosquitoes generally get bad press. Few people claim to like them, and many more really dislike them: a mosquito bite ranges from being merely irritating to deadly. However, like all creatures they have a role to play in an ecosystem. In the mosquito's case it is both positive and negative.
Thousands of animal and plant species disappear each year. In addition, the extinction of a single species can lead to the disappearance of others and to the destabilisation of entire ecosystems. The tiger, in particular, is a super predator.