Sex

There is no denying that sex is fantastic and that a wide range of animals on Earth use it for reproduction, even though this doesn't make a lot of sense from an evolutionary perspective. As sexual reproduction offers no immediate advantages over asexual reproduction, scientists have been unsuccessfully trying to explain why we evolved it in the first place.

The widely accepted view until this point has been that it helps remove bad genes from the pool, which may or may not be accurate, but that's nowhere near worth the enormous evolutionary cost it comes with. Due to the fact that one half of the population, males, do not procreate, sexual beings only transmit half of their genes to their progeny. It poses a serious threat to life in a cutthroat environment like Earth since asexual animals pass on 100% of their genes without having to go out and search for a spouse who is compatible with reproduction.

However, one study demonstrated that a species' incidence of deleterious mutations is much too low to support its contribution to the development of sex. But, since sexual reproduction accounts for around 99% of all multicellular organisms on Earth, it must have some distinct advantages over asexual reproduction. Apart from the obvious fact that sex feels amazing, what they are remains one of evolutionary biology's greatest mysteries.