Question

Earth is home to more than 20 million kinds of organisms, and all have DNA

Answer 1

Answer:B. Their DNA molecules have different numbers of strands.

Explanation:that is chromosome that make them to differ in diploid numbers thus differ generally and appear differently

Answer 2

I disagree with the above answer. The answer should be D as the different nucleotide sequences would result in different proteins formed and synthesized that would eventually perform different functions and account the for the structural differences between the two species. While amount of DNA differ, it does not account for the vast differences observed.