Scientists must know how complete the record is in order to find out how long the extinction of dinosaurs took. To use the movie example, it's like trying to find how much time has passed since an event (like a murder) occurred. If all of the frames are present, we know the amount...
Chichén Itzá’s connection to spirituality and astronomy The Temple of Kukulcan owes its name to the main god of the Maya, Kukulcan, who is believed to be the Maya representation of Quetzalcoatl, the “feathered snake god” revered by the Aztec and the Toltec. ...
When chickens eat food, it passes through their digestive system and is broken down into nutrients that can be used by their body. The waste products from this process, both solid feces and liquid urine, are mixed in the cloaca, and exited through the vent. ...