Charles darwin's book on the origin of species (1859) was considered an important contribution to modern science because it:

The answer is it synthesized information from diverse scientific fields in order to document evolutionary change. The book introduced the concept ‘survival for the fittest’ which is the basis for natural selection. In addition from accumulated evidence from research papers, the Beagle expedition to the Galapagos islands contributed to his findings.

format change of dna.  

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.