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A gear is a rotating circular machine part having cut teeth or in the case of a cogwheel or gearwheel inserted teeth called cogs which mesh with another compatible toothed part to transmit convert torque and speed. Join Maddie as she finds out how things work.

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The basic principle behind the operation of gears is analogous to the basic principle of levers.

. On land they are easily recognized as plants. Although marine primary production by coral reefs mangroves and seagrasses is relatively better-known the vast majority of primary production in the sea is by microscopic single-celled plants called. The misconceptions themselves are implied rather than stated.

These entries are concise summaries of the main subject articles which can be consulted for more detail. Maddies Do You Know. Find out more about what animals need to survive with this video and test what youve learned with the activity and quiz below.

This is a list of common misconceptionsEach entry is worded as a correction. All life depends ultimately on primary producers the organisms which capture the energy in sunlight by photosynthesis. Animals need air water shelter and food to survive.

A gear may also be known informally as a cog.

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