This image shows an X-ray diffraction photograph of DNA, like those made by Rosalind Franklin and Maurice Wilkins. Which of the following
best describes what was learned about DNA from images like this one?

Purines have two carbon rings, while pyrimidines have one.

DNA is composed of millions of nucleotides bonded in a chain.

There are four possible kinds of nucleotides in DNA.

DNA has a double-helical structure

Aremote community desperately needs more electrical energy. it is located in an area with the following characteristics: average wind speed of 15 – 20 km/hr some medium-sized rivers with slow-moving currents few coal deposits some oil exploration being conducted within 400 miles based on the above information, which energy source would be the most economical and safest for the community to pursue? a. fossil fuel b. hydroelectric c. nuclear d. wind