The best answer is B.
In the year 1962, Maurice Wilkins and Francis Crick jointly received the Nobel peace prize in physiology and medicine for their determination of the structure of deoxyribonucleic acid (DNA) in the year 1953. Their colleague called Rosalind Franklin was not there at the time because he had died of cancer earlier on.
Once the double helix structure and the molecules of DNA was known it brought a new and better understanding of heredity and hereditary disease
Wolves are causing a trophic cascade of ecological change, including helping to increase beaver populations and bring back aspen, and vegetation.beavers.
