water bear

Have you ever heard about water bears? It is a very small animal which belongs to a group called tardigrada (meaning slow-moving creature). Usually you cannot see them with your naked eyes, but they are everywhere. It's actually EVERYWHERE, including wet land, dry land, pond water, the bottom of the ocean, near crater, and around you. You may think that they are a little cute when you see them by using microscopes because of their slow movements and chunky appearance.
The surprising fact of water bears is that they are the strongest living creature in the world. They are not strong in the way that they can push something really heavy, or have extremely poisonous toxins, but they can endure any kinds of severe environment which all the other livings cannot survive. For example, they can endure extreme dryness, about 150 degrees Celsius to the absolute zero (-273 degrees Celsius), vacuum space to 70,000 atmospheric pressure, and also many kinds of radioactive rays! Isn't it bizarre that there is an animal which can even live in the space!? They developed a living strategy called Cryptobiosis to live in any environment.
Another surprising fact which was found recently, is they possess genes from many life groups such as bacteria, fungi, plant, archaea, and virus even though water bears belong to animal kingdom. It is still a mystery of biology and more studies are required to clarify the ability. Because water bears have genes from different life groups and the immortality, humans may find the way to obtain "eternal life".