Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest
Sea Monsters Probably gave Birth To Live Young
-
24-09-2009 11:53am#1The latest analysis shows that the marine reptiles (such as plesiosaurs and mosasaurs) which inhabited the seas when the dinosaurs ruled the land did not lay eggs like most reptiles, but gave birth to live young*. It also appears that their babies' sex was predetermined, similar to modern crocodiles which are predetermined by temperature.Most reptiles lay eggs but these cannot survive underwater, so live birth gave these newly-evolved reptiles the ability to invade the seas. The research from the University of Reading and Harvard University shows that the evolution of live births required the prior acquisition of a genetic mechanism for determining the sex of offspring. It was this pair of traits which enabled reptiles to adapt to a variety of marine conditions producing many species similar to present-day whales.
Full article here.
*Of course this was already known about ichthyosaurs
1
Advertisement