Answer:
The Biosphere
Explanation:
The biosphere is made up of all living organisms and is inextricably linked to the other three spheres: most live organisms need gases from the atmosphere, water from the hydrosphere, and nutrients and minerals from the geosphere.
Answer:
B, A fossil found in rocks from one time period
Explanation:
Fossils are used to determine the ages of rock layers. Index fossils are the most useful for this. Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in. Hope that this helps you :)