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Answer:
The viral genome is covered by a nucleocapsid protein called N. Two other proteins in the virus are the large protein called L, and the phosphoprotein called P. Both of these are involved with making new copies of the measles virus.
Explanation:
I got this from the wikipedia
The correct answer of the given question above would be the third option: THE EVOLUTION OF POPULATIONS OVER TIME. What is represented by the base of a phylogenic tree is the evolution of populations over time. It is also known as the evolutionary tree. This tree shows the evolutionary relationships among species.