Some species reproduce without sex. Here's the science behind why humans need to do it manually, by neuroquest
Some species of vertebrates reproduce through parthenogenesis, where non-fertilized eggs develop into viable animals.
It turns out that Fitzgerald's ode to love was a more comprehensive description of activities leading to reproduction than she may have realized.reproduction, but certain species of birds, bees, and fleas reproduce, not solely through sex, but also through a process called parthenogenic animals develop eggs that hatch into a viable animal without ever being fertilized by a male’s sperm.
In these creatures, having sex is not strictly required for the survival of the species, but under some circumstances, the animals choose to do it anyway.have sex could provide important clues about why humans have evolved exclusively sexual reproduction, instead of simply popping out unfertilized eggs that develop into viable babies.
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