DID YOU KNOW? Sharks are the only animals that are immune to every known disease including cancer. Their body frames are not made up of bones but cartilage - the tough, fibrous tissue that shapes our noses and ears. Instead of scales, shark skins have small tooth-like spikes that are so sharp that it has long been used as sandpaper. It is thought that some types of big sharks, including the Great White Shark, change sex when they reach a certain size - males become females to ensure survival of their species.
Photo credit: vertebratejournal.org
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