____ is a cloud with its base at the earth's surface.

Darwin’s studies of animals in the Galapagos Islands were important in the development of the

theory of evolution. Indicate whether the statement is true or false.

The general chemical equation for photosynthesis is shown below. Through this reaction is the carbon oxidized or reduced? How can you tell? 6 CO2 + 6H2O ? C6H12O6 + 6 O2

A) Oxidized, since carbon is in the +4 oxidation state in but in the +6 oxidation state in the product, C6H12O6, glucose. B) Reduced, since in carbon dioxide there are two oxygen atoms for every one carbon but within the product, C6H12O6, (glucose), there is only one oxygen for every one carbon. C) Neither, since carbon does not change its oxidation state and is neither oxidized nor reduced. D) Both, since the carbon atoms within the glucose molecules display two different charge states.

Point bars are sandbars deposited in the middle of river channels.

Answer the following statement true (T) or false (F)

Which of the following types of radiation might be best for medical imaging?

A) Gamma radiation would be best because it penetrates the best. B) Alpha radiation would be best because it penetrates the least and therefore does the least damage. C) Beta radiation would be best because it can be measured electrically. D) Only X-rays are used for medical imaging. E) none of the above