Nucleotides. They are the building blocks of DNA.
B). Brainly said I’m wrong when I tried submitting it
I think its a because risk actually means exposure to danger our sacrifice your self plz mark as brainly
Answer:
a vestigial structure
Explanation:
Vestigial structures are a rudimentary (or even functionless) version of a body part, but they have important functions in a closely correlated or evolutionarily close species, an example of which is the presence of eyes in fish of the genus Astyanax. The existence of these vestigial structures is strong evidence that evolution occurs in organisms, since this structure, today without much apparent function, may in the past have been extremely important to the ancestors of that species.
