Original sentence: Charles Darwin conjectured that the male beard, as well as the relative hairlessness of humans compared to nearly all other mammals, are results of sexual selection.During human evolution, on at least two occasions, hominid brain size increased rapidly over a relatively short period of time followed by a period of stasis
Edited sentence: Charles Darwin conjectured that the male beard, as well as the hairlessness of humans compared to nearly all other mammals, are results of sexual selection.During human evolution, on at least two occasions, hominid brain size increased rapidly over a short period of time followed by a period of stasis