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I’m not 100% sure if this is a scientific theory but I’m going with the big bang theory. The big bang theory is a scientist best guess on how the world came to be. A 2013 map of the background radiation left over from the Big Bang, taken by the ESA's Planck spacecraft, captured the oldest light in the universe. This information helps astronomers determine the age of the universe.
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During DNA replication, the hydrogen bonds must be broken between the complementary nitrogenous bases in the DNA double helix
Gene regulation is the process of turning genes on and off. It is accomplished by a variety of mechanisms including chemically modifying genes and using regulatory proteins to turn genes on or off.