It lived around 75 million years ago, during the Cretaceous period, and was around 8 metres long. Both birds and crocodiles have âcloacasâ , so itâs likely that dinosaurs did too. Cloacas are one opening that deals with intestinal, reproductive, and urinary tracts.In most early bird species, males had a penis that only emerged from the cloaca to deliver sperm when they had sex. So dinos probably did too.oth birds and crocodiles have âcloacasâ , so itâs likely that dinosaurs did too. Cloacas are one opening that deals with intestinal, reproductive, and urinary tracts. In most early bird species, males had a penis that only emerged from the cloaca to deliver sperm when they had sex. So dinos probably did too.
The cause of failure to grow new hair in female pattern baldness is not well understood, but it is associated with genetic predisposition, aging, and levels of hormones (particularly androgens, the male sex hormones). Changes in the levels of androgens can affect hair production.
Baldness happens because of the genes people inherit from both their mom and dad. Some studies show that 80% of balding is genetic. A key gene can come from a maternal grandpa. But this gene doesn't explain all baldness. People are just as likely to be bald if their dad or their maternal grandfather is bald. Two new studies have fingered a small region on chromosome 20 called 20p11 as being associated with balding. This sort of thing could explain people who are bald even though their mom's dad still has a full head of hair.