What is gravity ?
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gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... Gravity is measured by the acceleration that it gives to freely falling objects. At Earth's surface the acceleration of gravity is about 9.8 metres (32 feet) per second per second.

The force that makes any body (object) with mass to fall down towards the centre of the Earth is known as gravity.

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c. heat from the poles back down towards the equator.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.