Well fossils can tell you a lot about the age of the rock it was found in, and an index fossil are used to used to define periods of geologic time.
This is the chemical formula for photosynthesis. Instead of just saying "Energy," however, it should specify solar energy, or light energy. Photosynthesis is the process of capturing solar energy and converting it to chemical energy.
This Is called deforestacion if to many trees are cut animals either have to adapt or find a new place if this doesnt happen the die