Which best describes the structure of a DNA molecule? a. Two strands of dna linked together.
b. Two strands of amino acids linked together
c. Two strands of rna linked together
d. A strand of dna linked to a strand of rna
I'm between the top two. Please help guys!

Explain how organisms could be harmed by high levels of salt from roadways?

How is the carbon cycle related to global warming ?

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.