The DNA sequence for the species are:

1. Species A - CTAACGTTGC. 'A' which is fourth in the series is marked yellow.
2. Species B - CGAGCGTTAC. 'G' which is second in the series is marked purple and 'A' which is ninth in the series is marked yellow..
3. Species C - CTAGCGTCGC. 'C' which is eighth in the series is marked pink.