bone

When people donate blood, stem cells in the bone marrow make new blood cells to replace the lost blood - and this could shape the stem cells' genetic diversity.

The debate remains unresolved in part due to sharks lacking bones and discovering cartilage skeletons is relatively rare.

Furthermore, the differences in bone density were negligible.

"It was raining all the days we were there. We were drenched to our bones," he said.

Experts identified the dinosaur's spine, ribs and a hip bones.