Answer:
1st graph/diagram --> 2nd description (between top and bottom)
2nd graph/diagram --> 3rd description (bottom/last one)
3rd graph/diagram --> 1st description (top one)
An organ is a group of tissues working together to perform specific functions. An example of an organ is the heart.
the answer for your question is C
The 1. is the gene, 2. - dna and the last one is the rna :)