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Mitochondria convert the food we eat into energy our cells can use. Scientists believe mitochondria were once free-living bacteria that were absorbed by early cells billions of years ago, which is why they have their own DNA.
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76
What force keeps us on the ground and the planets orbiting the Sun?
70What is the largest planet in our solar system?
63What is the chemical symbol for water?
53What force keeps us on the ground and the planets orbiting the Sun?
52What gas do plants absorb from the atmosphere?
48What part of the cell is known as the 'powerhouse'?