Explain why the trilobite fossils in rock layer A are considered to be younger than the yrilobite fossils in rock layer D.

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

There is only one climate type in motion across the world at a time

The european union was formally established in