Codón o condón por que la información que yo tengo es de CONDON
Answer:
Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
The type of digestion that involves the actual breaking apart and chewing of food is called MECHANICAL DIGESTION. Mechanical digestion increases the surface areas of the food which makes the food easier to digest. Examples of mechanical digestion are mastication and peristalsis.