Hmm. There are more than 3 types of fossils. The 3 most common types of fossils are Mold (where an organism is buried in sediment and then decays, leaving an empty space. Cast (when minerals in rocks fill a space by a decayed oransim. and then trace were a dinosaur leaves a foot print.
The average adult, when resting, inhales and exhales about 7 or 8 liters of air per minute. That totals about 11,000 liters of air per day. Inhaled air is about 20-percent oxygen. Exhaled air is about 15-percent oxygen.
