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Because Mars is the one of the closest planets to Earth in the Solar System, some people have wondered if there is any kind of life on Mars. Recently, scientists found an old meteorite that had landed near the Earth's South Pole and decided it had come from Mars. In the meteorite they found some very tiny little shapes in the rock which they think might be fossils made by living things. However, they were not sure if it was life or just the natural patterns of the rock. If it were the fossils of a living thing, it was probably some simple plant, and one hundred of them could fit across the width of a single hair.
It is also possible that there are also pieces of the Earth on Mars. If a giant meteorite hit the Earth, the force would be strong enough to send pieces of the earth up to space. If a piece of Earth left the atmosphere, it would take along with it lots of cells and bacteria, which are living things.
Source: wikipedia.org