20.) CCC Proportion What are the top three sources of U. S. electricity generation? Estimate the overall efficiency of U. S. electricity generation. How
does this compare to the efficiency for transportation?

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i