- Sharks are almost the oldest living things on earth.
- 100-70 million years ago, the first sharks evolved.
- All species of sharks are spread out throughout the worlds oceans.
- There are around 250-300 species of sharks in the world.
- Fossil records show that the first sharks lived 300 million years ago.
- Shark fossils are extremely rare because they are mainly made of cartilage.
- The skin of a female shark is thcker than a males.
- A shark has 5-6 gill slits.
- Sharks do not have flaps over their gills.
- Some even say there are around 465 species of sharks.
- sharks are near the top of the marine food chain.
- Sharks belong to a family of fish that have skeletons made of cartilage.
- Sharks breathe through a series of 5-7 gills.
- All sharks have multiple rows of teeth.
- Shark numbers are on the decline due to many threats.
- Sharks have very sensitive hearing.
- Sharks can hear a sound from 700ft away.
- The greenland shark is the slowest fish ever recorded.
- Sharks have the most powerful jaws on the planet.
- A shark bites with its upper jaw first.
- Each sharks tooth is a different shape.
- A shark may grow 20,000 teeth in a lifetime.
- Sharks never run out of teeth.
- All sharks are carnivores.
- Hammerhead sharks heads have electrical sensors that help them with hunting.
- The majority of sharks have 8 fins.
- Sharks eat other sharks.
- Sharks skin is made of denticles.
- There are only about 100 shark attacks each year.
- Humans kill up to 100 million sharks per year.
- Sharks livers contain oil.
- Hammerhead sharks travel in schools.
- Sharks can have up to 3,000 teeth at once.
- Sharks cartilage is more flexible than bone.
- Some sharks will eat their siblings eggs.
- Great whites eat up to eleven tons of food a year.
- Sharks jaws are not attached to their skull.
- Sharks teeth are covered in flouride.
- Female sharks are larger than male sharks.
- Sharks come in a big variety of shapes.
- the gestation period for a pregnant shark can be from five months-two years.
- Some female sharks use sperm from multiple males to reproduce.
- Bullsharks can also be found in freshwater.
- Whale sharks are the largest shark species.
- Not even 100 maegamouth sharks have been seen.
- The megamouth can grow to be 15ft long.
- The blue shark can give birth to 135 pups per liter.
- Some sharks lay eggs and others grow the pups inside of them.
- A shark is covered in tooth like scales.
- Lantern sharks can glow in deep waters to distinguish theirselves.
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