The answer is A - cytosine and adenine
Answer:
The class of this compound is <u>aldehyde or ketone (i).</u>
Explanation:
Absorption peak at 1720 cm-1 shows the presence of a carbonyl group, possibly an aldehyde or ketone with C=O bond.
Further information on molecular formula would be required for structural elucidation.
When carbonate sediments are subjected to thermal or regional metamorphism, the CO2 cannot often escape and the carbonate minerals simply recrystallize; calcite and dolomite commonly form marble. Carbonate minerals can therefore be common in some metamorphic rocks.
Explanation:
Convectional rainfall.
Orographic or relief rainfall.
Cyclonic or frontal rainfall