1. None
   Between 200 and 350
2. 478
   145

That's right, sharks don't have bones. As a matter of fact, this is what separates their species from other fish. However, sharks do have skeletons that are made out of cartilage (the stuff our ears are made out of).

1. When they're 1 year old
   When they're still embryos
2. When they're a month old
   After they hatch

Believe it or not, sharks start attacking before they leave their eggs. While this has been studied in different species of shark, the most common occurrence was found in sand sharks. The mother shark can carry a dozen embryos, but only the largest is born (because he eats the rest of them).

1. 180 degrees
   270 degrees
2. 120 degrees
   360 degrees

With their eyes set perfectly on their sides, hammerheads vision from each eye actually overlaps. Imagine walking around with your eyes crossed and trying to figure out which eye you should focus on. Hammerheads may be a little more advanced than us in this regard.

1. 30 feet
   120 feet
2. 40 feet
   175 feet

The whale shark is known as the largest fish (Remember that whales themselves are mammals). They may be able to swallow a man whole, but they're actually filter feeders who rely mostly on plankton to live.

1. Males
   Females
2. They're both the same.
   The majority of species are similar in size.

Scientists assume that the size of the female is significantly larger, because she's the one who has to carry around shark babies. However, it could just be because large females are highly respected within shark society.

1. Tropical rivers
   The Antarctic Ocean
2. The Baltic Sea
   The Dead Sea

Don't go thinking you're safe if you swim in fresh water. There are species of shark that can be found in lakes and fresh water. The bull shark, for example, can swim in both fresh and salt water.

1. Spiny dogfish
   Great white
2. Whale shark
   Tiger shark

The spiny dogfish shark holds the record for gestation period in vertebrates: It holds its baby for two years. That's at least two summers, and if you know what it's like being pregnant in the summer, you probably pity this poor fish.

1. 2,000 PSI
   100 PSI
2. 4,000 PSI
   1,500 PSI

The jaws of a great white shark are actually stronger than most large cats (which is saying a lot). By comparison, a human's jaws usually produces around 200 PSI ... No wonder we can't break bones with our teeth.

1. 147
   85
2. 52
   19

Contrary to popular belief and what Hollywood films might make you think, we really only average about 19 shark bites each year, and very few of those are deadly.

1. One every 2 years
   One every year
2. Two every year
   Ten every year

With the small amount of shark attacks that do happen, very few of them end up deadly. This is because, for the most part, sharks accidentally bite humans thinking that they're a different animal. Therefore, one bite is all you get. Sharks don't like eating people, so they usually swim away after the first bite; however, if that first bite hits an artery, the human is in a lot of trouble.

1. 65%
   93%
2. 52%
   71%

This is an astounding statistic, and it goes back through every shark attack on record since 1580. Many think that this is the case because there are more males than females in the waters where sharks dwell.

1. 50,000
   100,000
2. 80,000
   125,000

We all know that sharks have rows and rows of teeth (These are called "series"). There are sharks that have fifteen series of teeth. This makes sharks even more frightening, as you can't just knock their teeth out to protect yourself.

1. Great white
   Goblin shark
2. Tiger
   Bull head

Goblin sharks are often considered the ugliest creatures in all the world. They live at the bottom of the ocean with the all the other terrifying creatures (including the angler fish). Scientists estimate that this species of shark is around 125 million years old.

1. 2 feet
   4 inches
2. 10 inches
   6 inches

The whale shark's skin is so thick that scientists have had issues attempting to take blood samples from the creature. If their skin protects them from needles, it also protects them against other predators.

1. 200 miles
   250 miles
2. 2,500 miles
   2,000 miles

That's right. Sharks don't stop to eat, sleep, rest or use the bathroom (They probably just do that while they're swimming). They can travel for days without stopping for a second. That's impressive.

1. Physical actions
   They don't communicate.
2. Sound waves
   Clicking their tongues

Different shark species have different methods of communication, but none of them can use sounds, as they don't have vocal cords. Instead, they flap their tails or just bite things they don't like.

1. Whales
   Humans
2. Other sharks
   Seaweed

Humans can kill up to 73 million sharks a year. While many of these deaths can be from our garbage littering the oceans, they are also killed on accident by boats, fished for food and hunted for trophies.

1. Its nose
   Its eyes
2. Its tail fin
   Its gills

The thresher shark can be spotted from the enlarged and elongated top tail fin on its back. These sharks are usually found in tropical waters, and warm climates and are also known as the fox shark.

1. It can turn on angles.
   It has a triangular head fin.
2. Its body is a right angle.
   It has a rough tongue.

This shark has triangles all over its body, and its name cannot compare to how unique and interesting this shark actually looks. It also has teeth-like scales all over its body, making it very rough.

1. Most sharks are blind.
   Most sharks have great eyesight.
2. Most sharks have a 360-degree field of view.
   Most sharks have no eyes.

Not only do most species of sharks have great eyesight, many of them can actually see in the dark. That doesn't just include the sharks that dwell at the bottom of the ocean in the midnight zone.

1. The count their spots.
   They count their teeth.
2. They count the rings on their vertebrae.
   They look into their eyes.

Just like trees, as sharks grow, they develop rings on their vertebrae. This helps scientists know an approximate age for the shark. While this isn't the most accurate way to tell the age of a shark, it does help give scientists an idea of how long a shark can live.

1. Wobbegong
   Sand shark
2. Thresher shark
   Mackerel shark

While we might look at the name of the wobbegong and think that it's a made up word, these sharks are often found on the sandy floors near shorelines. They are often mistakenly caught in fishermen's nets.

1. The Indian Ocean
   The Pacific Ocean
2. The Atlantic Ocean
   Every ocean has at least one species of shark.

No matter where you look, you'll find a shark in the ocean. As we know, sharks don't necessarily have to stay in salt water, though. Some shark species have evolved to be able to live in both fresh water and salt water.

1. They have eyelids.
   They eat other fish.
2. They have fins.
   They have soft bellies.

In case you were wondering, a shark cannot blink. Their eyes have eyelids, unlike every other kind of fish in the ocean. The reason they don't use those eyelids is because as they swim, the water cleans their eyes for them.

1. Only forward
   Only backward
2. Only sideways
   Every way

While many fish are able to swim in different directions (including backward), sharks are only able to swim forward. They can turn, but they are basically only able to swim in the direction their noses point to, because of their stiff fins.

1. About six inches
   Two feet
2. Three yards
   One foot

The dwarf lantern shark is the smallest shark recorded by scientists. They usually just eat krill and other small fish and crustaceans. There are goldfish that live to be bigger than these sharks!

1. Two yards away
   Ten feet away
2. 3,000 feet away
   100 feet away

Along with their great sense of sight, sharks also have an incredible sense of hearing. These two senses combined make them one of the most efficient predators on the planet.

1. It is the smallest of all fish.
   It is the largest of all fish.
2. Sharks have two brains.
   Sharks don't have brains.

Compared to all of the other fish in the ocean, a shark has the largest brain. While dolphins might be the smartest thing in the ocean, remember that dolphins are mammals and sharks are fish.

1. Yes, larger sharks live longer.
   No, smaller sharks live longer.
2. They both live the same time.
   It depends on the species.

While the majority of shark species live for about 20 or 30 years, it's common to see larger sharks live longer. For example, scientists have found that great white sharks can live up to forty years, and they are one of the biggest shark species.

1. 35,000 years ago
   35 years ago
2. 100 million years ago
   20 million years ago

Scientists believe that the hammerhead shark is the youngest new species of shark, having evolved from a different species some 20 million years ago. They believe this because no hammerhead fossils have been seen from before this time period.

1. In large groups
   With a partner
2. Alone
   Sharks don't hunt.

With exceptions in a few speices, most sharks like to hunt by themselves. The hammerhead shark does swim in packs and hunt together, but most other species of sharks aren't about sharing with the group.

1. They don't jump out of the water.
   10 feet
2. 30 feet
   Only a couple of inches

When great white sharks are hunting, they're known to do anything to catch their prey. That means that if their prey jumps, the great white will follow, and usually catch, the fish while it is out of water.

1. The great white
   Tiger sharks
2. Epaulette sharks
   Swallow sharks

A epaulette shark doesn't necessarily look like a regular shark, and part of that is because inches across the sea floor. These sharks are often found near the coasts of Australia and in other tropical waters.

1. They can move both their upper and lower jaws.
   They don't have bad breath.
2. They have two tongues.
   Their gills are on their tongues.

With two jaws working at the same time, it's no wonder how a shark can produce 4,000 of pressure with each bite. This unique mouth movement helps them tear their food up and hunt.

1. 30 years ago
   100 years ago
2. 50 years ago
   25 million years ago

The word "Megalodon" means "big tooth," but there was much more about this shark that was big. These massive sharks were thought to reach nearly 60 feet long. They're the stuff nightmares are made of!