日本語クロスワード - Shark

The shark is one of the oldest fauna on earth. In their suborder includes about 500 species of different sizes and weight. But they all have a perfect torpedo-like body, keen eyesight and hearing, and catch odors from miles away. the Smell of blood catch at a concentration of 1 mol to 1000000 mol of water. The main weapon of many sharp teeth.In some countries, are commercial species.