Clear_Flower_4552
Clear_Flower_4552 t1_j0xjg4t wrote
Reply to comment by Xploited_HnterGather in TIL that The sex of birds is determined by the Z and W sex chromosomes, rather than by the X and Y chromosomes present in mammals. Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ). by treeofliife
Sexual reproduction, specifically males and females, vastly predates human beings. Both sexes are a natural requirement for the species to exist.
You may find it interesting how nest temperature determines reptile sex.
https://embryo.asu.edu/pages/temperature-dependent-sex-determination-reptiles
Clear_Flower_4552 t1_ixnoli7 wrote
Reply to comment by Throwawaycuzawkward in TIL that ruminants, such as cattle, sheep, and giraffes, do not have a top row of front teeth. They instead have a dental pad where gums meet directly to their bottom row of front teeth. by gmnitsua
Tapirs can be hundreds of pounds and one literally ripped a woman’s arm off a few years ago.
Generally they aren’t aggressive, but they can definitely wreck someone if they want to.
Clear_Flower_4552 t1_j0xk5jy wrote
Reply to comment by ZhouDa in TIL that The sex of birds is determined by the Z and W sex chromosomes, rather than by the X and Y chromosomes present in mammals. Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ). by treeofliife
There are lots of structural differences like that. These differences contribute to female athletes being much more prone to certain injuries.
“Gender Differences Mean More Knee Injuries for Women“
https://www.cedars-sinai.org/blog/gender-differences-knee-injuries.html