--- title: Megalodon and the giants of the sea, past and present — a lesson of Mova's school · trees and pragmatics description: «Megalodon and the giants of the sea, past and present», a lesson of the biology course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Megalodon was a giant shark, perhaps 15 to 20 metres long, with teeth up to 17 centimetres, bigger than a child's ha --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Biology](https://md.mova.elamur.ai/free/en/corpora/school/biology/) / Megalodon and the giants of the sea, p… # Megalodon and the giants of the sea, past and present Lesson 273 of the biology course of Mova's primary school: 15 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/biology/273-megalodon-and-the-giants-of-the-sea/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/0/) — Megalodon was a giant shark, perhaps 15 to 20 metres long, with teeth up to 17 centimetres, bigger than a child's hand, and it ate whales until it died out about 3.6 million years ago. - [2](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/2/) — Sharks lose and replace teeth all their lives, thousands of them, so old teeth pile up on the sea floor, and that is why you can find a black fossil shark tooth on a beach. - [3](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/3/) — The deep sea still keeps secrets: the coelacanth, thought extinct for 66 million years, turned up in a fishing net in 1938, and giant squid were first filmed alive only in 2004. - [4](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/4/) — Yet the biggest animal of all time is not a lost monster but alive today: the blue whale, up to about 30 metres long, heavier than any dinosaur. - [5](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/5/) — Megalodon was a giant shark, perhaps 15 to 20 metres long, with teeth up to about 17 centimetres; it ate whales and died out about 3.6 million years ago. - [6](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/6/) — Megalodon is extinct: no fresh teeth, bitten whales or sightings are found; as the seas cooled, its whale prey moved to cold water it could not follow. - [7](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/7/) — Great white sharks competed for the same food, and tooth chemistry suggests they ate at the same level of the food chain, so they may have helped finish megalodon; this is still debated. - [8](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/8/) — Fossil places with many small megalodon teeth near the shore show that the young grew up in warm, shallow nurseries, as great whites and many sharks still do. - [9](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/9/) — Dunkleosteus was an armoured fish that lived about 360 million years ago; it had no teeth but sharp bony blades in its jaws and one of the strongest bites of any fish. - [10](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/10/) — Livyatan was a sperm whale relative with teeth up to 36 centimetres that hunted other whales at the same time as megalodon; it is named after the Leviathan of old stories. - [11](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/11/) — Sea scorpions were relatives of spiders that lived over 400 million years ago, and the biggest were longer than a man. - [12](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/12/) — The coelacanth was thought extinct for 66 million years until one was caught off South Africa in 1938; it lives deep down, and its fleshy fins move like legs. - [13](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/13/) — The blue whale is the biggest animal known ever to have lived, up to about 30 metres long, because water holds up its weight. - [14](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/14/) — Giant squid live deep down in the dark sea, so they are rarely seen; they can be about 12 metres long with their tentacles and were first filmed alive in 2004; the heavier colossal squid was reported to be filmed alive in its deep home in 2025. - [15](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/15/) — Sharks lose and replace thousands of teeth in their lives; old teeth fall to the sea floor, can become fossils, and are turned black by minerals over a long time. - ← previous: [Mammoths and the Ice Age giants: sabre-tooths, ground sloths and woolly rhinos](https://md.mova.elamur.ai/free/en/corpora/school/biology/272-mammoths-and-the-ice-age-giants/) - next →: [Terror birds, moas, giant insects and other lost giants](https://md.mova.elamur.ai/free/en/corpora/school/biology/274-terror-birds-moas-giant-insects-and-lost-giants/) - ↑ back to [Biology](https://md.mova.elamur.ai/free/en/corpora/school/biology/)