The cuticle blocks water from evaporating from the leaves.
Fossils are formed in a number of different ways, but most are formed when a plant or animal dies in a watery environment and is buried in mud and silt. Soft tissues quickly decompose leaving the hard bones or shells behind. Over time sediment builds over the top and hardens into rock.
Osmosis is the net movement of water from a region of higher water potential to a region of lower water potential through a partially permeable membrane
The answer to your question is vacuole
