How is it possible for different species to be so similar?

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

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.

What is it called when lava when it erupts from the surface through volcanoes.