how did the coyote test positive for the carbon atom found inside the buried body

If a body is buried at the base of a mountain and there are lots of wildlife around. A couple years later a 1 year old coyote was tested for carbon content and a carbon atom from the buried body was found in the coyote. How did the carbon atom from the buried body get inside the coyote without the coyote eating the buried body? Where did the carbon atoms from the buried body go when the body decayed? Why did the carbon atoms from the body remain as carbon atoms after death? Do atoms ever change into something else? What do coyotes eat? How could the carbon atom from the body end up in the food that coyotes eat?