Tuesday, 7 June 2016

Independent Learning Log 1 by Gavin Tay (11)


Source: http://www.bbc.com/earth/story/20151003-the-epic-history-of-sharks

What I did:

I searched up for shark-related news and came across this fascinating article called: The Epic History Of Sharks.

What I Learnt:

-The Epaulette Shark (Hemiscyllium Ocellatum) can walk on land 
- The frilled shark (chalmydoselachus anguineus) is flatter-bellied, adapted to hunt in the deep-sea
- The tasslled wobbegong (Eurcrossorhinus) is a carpet shark that resembles an old patterned rug and the goblin shark (Mitsukurina owstoni)
- There are about 500 known shark species to the world
- Their history started in the late Silurian period, about 450 million years ago. It was a time when sea levels were high and coral reefs began to form. The Earth's climate was warm and stable. Molluscs, crinoids and trilobites were some of the only living creatures on the Earth before scorpions and centipedes appeared  on the land.
- The teeth of the Leonodus shark actually look like the another shark's teeth called Xenacanthust appeared millions of years later in the Late Devonian, leading to speculation that Leonodus, like Xenacanthus, lived in freshwater.
- The reason the Devonian period is referred the 'Age of the sharks'

Summary :
This article is mainly about the history of sharks. It teaches us more about sharks and what happened in the Devonian period and why it is referred to as the 'Age of the Sharks".

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