Unless a series of sedimentary rock layers has been overturned, which layer is usually the oldest?

the layer on the top
the layer with the most minerals
the layer with the most fossils
the layer on the bottom
the igneous intrusion (dike)

List charasteristics of athenosphere

Which of the following is true of metabolism in its entirety in all organisms? a) metabolism depends on a constant supply of energy from food. b) metabolism uses all of an organism's resources. c) metabolism consists of all the energy transformation reactions in an organism. d) metabolism manages the increase of entropy in an organism.

Adding more tributaries to a local river basin can have what effect?