Cytosine is connected to guanine with three peptide bonds DNA only
RNA only
Both DNA and RNA
Neither DNA nor RNA

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

answer; hydrologic cycle;