English Rare Earth hypothesis Cited by user SqueakBox on 21 Aug 2015 According to the hypothesis, complex extraterrestrial life is an improbable phenomenon and likely to be rare.
English Evolution of sexual reproduction Cited by user Rjwilmsi on 05 Jan 2015 It seems that a sexual cycle is maintained because it improves the quality of progeny (fitness), despite making the creation of offspring less likely (the two-fold cost…