As CO2 levels increase in the ocean the bones of animals will be desolved
away. 250 million years ago the CO2 level were very high in the ocean and
was associated with a large die out of 98%. I was wondering if bones
came from a build up of calcium deposits in muscles to over come the
high CO2. The bones are modified muscle tissue. When the CO2 droped
the bones formed for the first time internally.