Bo is eating lunch today from the cafeteria. They are serving pizza or hamburgers. You can drink chocolate milk, water, or iced tea. For dessert, you can have a cookie or pudding. If Bo has to take one of each, how many choices does he have?
Answer: Is itScientists can determine the age of rock layers by using the fossils of extinct species, called index fossils, as a tool to identify the age of a rock layer.
