Which three statements provide reasons that scientists are considering renewable sources of energy? -Most renewable resources are clean and nonpolluting.
-Renewable resources can be replenished.
-Renewable resources are conventional resources.
-Most renewable resources are easily available in nature.
-All renewable resources are cost effective.

helicase, i think thats it

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.