Some characteristics of life are shared by all organisms on earth. Explain how the following observations made in Fairmount park provides evidence to support two specific characteristics of living things. "A robin flies to an oak tree and sits on its nest of blue eggs. you return two weeks later and you observe the same robin feeding worms to the baby robins."

the answer to your question is:

c. complementary base-pairing

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it