Evolution of any species is the balance of many many evolutionary pressures. There are physical pressures such as metabolism vs. rate of heat loss through skin, or buoyancy vs gravity. read more
Megalodon, the biggest shark to ever prowl the seas, got bigger over its evolutionary history, and its big size may have made it more prone to extinction. Megalodon, the biggest shark to ever prowl the seas, got bigger over its evolutionary history, and its big size may have made it more prone to extinction. read more