Photovoltaics perform what type of energy transformation?

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.

Political boundaries are determined by the political party in control at the time. true or false

What are economic benefits of building dams