This is a summary of the text:
The text is about different types of sharks and other sea creatures, some of which are extinct and some of which are still alive. It describes their appearance, size, diet, behavior, and adaptations. It also debunks some myths and misconceptions about sharks, such as their hunting habits, their ability to breathe, and their vulnerability to jellyfish. It also mentions how sharks are important for the marine ecosystem and how some of their features have inspired human inventions.
Here are the key facts extracted from the text:
1. Megalodon lived from 23 to 3.6 million years ago.
2. Its bite was more powerful than that of a Tyrannosaurus.
3. Megalodon had teeth that reached 18 centimeters in length.
4. It had about 300 teeth in at least 6 rows.
5. The shark itself grew up to 18 meters long.
6. An adult Megalodon weighed between 50-60 tons.
7. Megalodon went to shallow water to give birth.
8. Baby Megalodon teeth were found in nurseries.
9. At birth, a Megalodon calf reached two meters in length.
10. Megalodon became extinct around 2.6 million years ago.
11. Climate change and competition for food are theories for its extinction.
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