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The best and most correct answer among the choices provided by the question is <span>evolution.
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Evolution is about 65% cause of the natural selection.<span>
Hope my answer would be a great help for you.</span>
<span>When an overwhelming body of observations and measurements supports a scientific hypothesis or group of related hypotheses, it becomes a scientific theory. A scientific theory is defined as an explanation of an facet of the natural world that one can test repeatedly using defined protocols of observation and experimentation.</span>
When a haploid egg cell comes in contact with a haploid sperm cell they will fertilize and instantly began the cell cycle/mitosis.
A haploid egg cell, if not fertilized, will die after about 24 hours.