What are some hypotheses about pressures that drove loss and

What are some hypotheses about pressures that drove loss and fusion of bones observed across vertebrates\' skulls?

Solution

Answer:

The “embryological or evolutionary pressures” that are often drove either loss or fusion of bones in vertebrate skull. The differential onset of cranial bone formation is mainly relied upon \"time of onset of endochondrial ossification\" so that patterns of fusion of skull bones are resulted during embryonic development. This onset is variable in different vertebrates to generate chondrocranium and splachnocranium of skull. The loss of bones during the development is mainly based on cell apoptosis and tissue turnover according to the genetic events followed by molecular interactions