Which foundational concepts in biology were merged in the modern synthesis?  
            a.  darwin's theory of evolution and chargaff's rules of base pairing    b.  darwin's theory of evolution and watson's and crick's structure of dna    c.  darwin's theory of evolution and mendel's ideas of heritability    d.  darwin's theory of evolution and hershey's and chase's proof of dna as genetic material

C.

Explanation:

Darwin's theory of evolution and Mendel's ideas of heritability were merged into the modern synthesis.

i started to read this expecting to actually answer something serious but i was wrong that was the first time i laughed today

explanation:

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.