The answer is; There is a supermassive black hole that is about 15 million miles across
This supermassive black hole is called Sagittarius A* and is 14 million times the size of the sun. Most galaxies have a supermassive black hole in their center like the Milky Way. The earth is 26,000 light-years light from the black hole (within the arms of the galaxy) hence far enough from its annihilating force.
Scientists believe that our galaxy, the Milky Way, is home to millions of black holes. Only 60 of them have been officially detected. The correct answer is B. The largest known type of black hole is termed as a supermassive black hole and is located in the center of each galaxy. In the Milky Way, this is called Sagittarius A*.
In general, negative selection eliminates from the population very harmful changes to proteins that kill or stop reproduction. ... The authors also found a correlation between genes predicted to be under negative selection and genes implicated in certain hereditary diseases