Two of the nitrogen bases are called purines. These two are larger than the two called pyrimidines. The two purines are: A. Adedine and Guanine B. Thymine and Cytosine C. Adenine and Cytosine D. Cytosine and Guanine

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.