A. They are organic and found in living things
Answer:
Water is sucked up xylem by mass flow (cohesion-tension) which decreases the water potential in the root xylem. So water diffuses through the root cells to the xylem which decreases the water potential in the root epidermis cells, so water diffuses into root hair cells from soil by osmosis.
Explanation:
These fossils are very useful for us because we can use them to date the layers of rock that they are found in. Fossils that can be used in this way are called index fossils, and rock layers with the same index fossils in them can be correlated. Not my answer, link here for full
http://peter-mulroy.squarespace.com/correlating-rock-layers/
