Actively transport molecules across the cell membrane
The ultimate cause of plate tectonics is - the cooling of the Earth
For example, dead animals and plants can be preserved in amber , peat bogs, tar pits, or in ice. preserved traces of organisms, such as footprints, burrows and rootlet traces - these become covered by layers of sediment , which eventually become rock.
The deer population decreased drastically because there were so many hostile animals where the deer where. For instance the wolves went up, then down as the deer decreased. When the wolves were low, the deer increased in growth.