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  2. Cleaner fish - Wikipedia

    en.wikipedia.org/wiki/Cleaner_fish

    Cleaner fish. Cleaner fish are fish that show a specialist feeding strategy [1] by providing a service to other species, referred to as clients, [2] by removing dead skin, ectoparasites, and infected tissue from the surface or gill chambers. [2] This example of cleaning symbiosis represents mutualism and cooperation behaviour, [3] an ecological ...

  3. Cleaning symbiosis - Wikipedia

    en.wikipedia.org/wiki/Cleaning_symbiosis

    Cleaning symbiosis is a mutually beneficial association between individuals of two species, where one (the cleaner) removes and eats parasites and other materials from the surface of the other (the client). Cleaning symbiosis is well-known among marine fish, where some small species of cleaner fish, notably wrasses but also species in other ...

  4. Fish - Wikipedia

    en.wikipedia.org/wiki/Fish

    A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish , the latter including all living cartilaginous and bony fish , as well as the extinct placoderms and ...

  5. Angle grinder - Wikipedia

    en.wikipedia.org/wiki/Angle_grinder

    Angle grinder. An angle grinder, also known as a side grinder or disc grinder, is a handheld power tool used for grinding (abrasive cutting) and polishing. Although developed originally as tools for rigid abrasive discs, the availability of an interchangeable power source has encouraged their use with a wide variety of cutters and attachments.

  6. Block and tackle - Wikipedia

    en.wikipedia.org/wiki/Block_and_tackle

    A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load. The rope is threaded through the pulleys to provide mechanical ...

  7. Wheelchair - Wikipedia

    en.wikipedia.org/wiki/Wheelchair

    Wheelchair. A disabled man sitting in a wheelchair. A wheelchair is a mobilized form of chair using 2 or more wheels, a footrest and armrest usually cushioned. It is used when walking is difficult or impossible to do due to illnesses, injury, disabilities, or age related health conditions. Wheelchairs come in a wide variety of formats to meet ...