Multiple Choice The photographs showed the bases of DNA were held together by hydrogen bonds. The photographs showed the location of each adenine, guanine, cytosine, and thymine. The photographs indicated that DNA has a double helix structure. The photographs revealed the structure of the deoxyribose sugar. The photographs showed equal numbers of purines and pyrimidines.

Select all the correct answers. for a claim about the natural world to be considered scientific, what attributes must it have? a). it must be open to modification if new evidence doesn't completely support it. b). it must be based on scientific observations that can be repeated in a controlled setting. c). it must be applicable to future events and occurrences. d). it must be consistent with only a small portion of relevant observations or data.