They took out all of the internal organs except for the heart so that the body would dehydrate more easily. The body had to be dehydrate so that the body would not decay.
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They would use mummification.
Sorry, but I don't think we all know yet...
The process of preserving a human or animal body with chemicals is called mummification. Mummies have been found on every continent, both as a result of natural mummification (extreme cold, low humidity, or lack of air) or deliberate mummification. The mummies of ancient Egypt are the most well known, but the practice flourished in South America and Asia as well. The oldest mummy is the body of a child found in the Camarones Valley of Chile, dated from around 5050 BCE.
It wasn't. Mummification was used by anyone who could afford it and for animals.
It was the belief of the ancient Egyptians that the way they would experience the afterlife as a soul or "ka" would be influenced by the way their body is prepared through mummification.