Question on geography hw please

What does a movement along the demand curve show

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 middle east links which two continents? ●asia and europe●europ and africa●africa and asia●africa and australia