First, living things need a source of food. Energy is needed in order for living things to grow. Our main source of energy on Earth comes from the sun. Plants use the light from the sun for photosynthesis, and plants source of food comes from photosynthesis. While animals don't need the sun to produce their own food they do eat plants, and all plants go through photosynthesis. Planets that are far from the sun, such as Pluto, can not use the sun's light to produce food. Photosynthesis could never happen on Pluto. Therefore, there will never be any life on Pluto. In addition, living things also require water. Plants and animals both need fresh liquid water. Water is important to living things because it helps change energy from one form to another, such as light to food. Earth is the o

The speed of earth's rotation is very important to sustaining life. If our planet were to spin as fast as a planet like Jupiter, then important things would just fly off Earth. Solid things would fly off because of Earth's gravity, but the gas in our atmosphere would, and so might our water. If Earth rotated slower, then our temperatures would be effected. Earth is rotating at a perfect speed. Gravity is also very important for life. Gravity help hold things on a planet. If the Earth had less gravity, like Pluto, things would float away. The presence of a surface on a planet is also important. If you tried to stand on Jupiter you would sink to the core of the planet. This would happen because Jupiter is made of gas and has no surface, also Jupiter's gravity is more than twice as much as Earth's, so it pulls things to the center of the planet. Earth has a surface to stand on and enough gravity to hold thing on the surface.

nly planet known to have a large amount of liquid water. Mars does have polar ice caps, but no liquid water. Life can not survive on a planet with no liquid water.

Another unique feature of Earth is its atmosphere. A planet without an atmosphere, like Mercury, could never have any life. Living things have to breathe. If there is no atmosphere, then there is no gas for plants and anim

Some common words found in the essay are:
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Approximate Word count = 897
Approximate Pages = 4 (250 words per page double spaced)