Five continents that start and end with the same letter

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.

The two types of plains are coastal plains and lowland plains

Ray lo bisects nlm, lm=18, no=4, and ln=10. what is the value of x?