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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Because for example White blood cells which im pretty sure is Tcell if im not mistaken fight and the body from bacteria, theres a cell that clots at a wound and blood cells deliver oxygen through the body if all cells were to function the same way we all probaly wouldnt live but a few years in the slightest and there goes the human race GONE
The sequence of Nucleotides in a DNA molecule determine the protein that will be produced. Nucleotides are the basic structural unit of DNA.
