Extinct Sharks The first sharks appeared in the Devonian, about 420 million years ago. From the Cretaceous 100 million years ago, many species of sharks adopted their modern form. Since then, there have been around 500 species of sharks grouped into 35 families. Sharks breathe through five to seven-gill slits. In general, the more primitive …
Natural reserves Despite the technological development and population growth that led to urbanization and the irregular exploitation of nature? Some natural, terrestrial and marine reserves have protected themselves and their components and preserved the most endangered species of animal and plant life. You will know with us the most famous natural reserves in the world, …
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5 most expensive fish in the world A fish is usually valued based on how rare, beautiful, and unique it is. The more availability of fish, the cheaper the price. Although the fish sold are fish that will be used in the food industry, there are apparently freshwater fish that have been sold at exorbitant …