4. Various species of ammonites are excellent index fossils that mark the Jurassic and Cretaceous periods. What can a scientist conclude about two
separate rock layers that each hold ammonite fossils of the same species?
Do the depths of the rock layers affect this conclusion? Explain your
reasoning.

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.