Can someone help tell me what the correct answer is please- i got it wrong

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.

Alow pressure system is formed when an air mass cools over a cool surface and sinks. true or false

Which of the following statements about wearher along mountain ranges is correct