Global warming is heating up their environments and melting away their glacier habitat. If their home ever got completely rid of ice they'd die of a heat stroke.
Umm can you be a tad bit more specific?
Do you have a picture or something?
Active deffusion.. this way the water is retained and the unnecessary salts ions are expelled out.
Answer:
Spongy bone consists of plates (trabeculae) and bars of bone adjacent to small, irregular cavities that contain red bone marrow. The canaliculi connect to the adjacent cavities, instead of a central Haversian canal, to receive their blood supply.