In the Qur'an we read:
"Do not the disbelievers see that the heavens and the earth were joined together then we split them asunder, and we created from water every living thing, do they not believe?"
The noble Qur'an, Al-Anbia(21):30.
"And Allah has created every trodding creature from water......"
The noble Qur'an, Al-Noor(24):45.
"It is He who created from water a human...."
The noble Qur'an, Al-Furqan(25):54.
Water is the most common substance on Earth, covering more than 70% of the planet's surface. All living things consist mostly of water; for example, the human body is about two-thirds water (when you cremate a human what happens to him? Why?). Scientist tell us that all forms of life known to humanity today require three basic conditions: Temperature, the existence of water, and the existence of an atmosphere.
All metabolisms require water to survive, so animals that exist in arid regions have body mechanisms that protect against water loss and make maximum use of water (camels for example). Dehydration in humans results from lack of food, drink, and from sweating, in addition to other factors. This loss eventually affects the proper functioning of the heart, central nervous system, and organs containing smooth muscle. Finally, intercellular water is lost, which upsets vital chemical processes in the cells. If water is not restored to the body, death will usually occur within a few days.
The blood of all living creatures is composed of 55 percent plasma, which in turn is composed of more than 90 percent water. Jan Baptista van Helmont, the first experimental physiologist, around 1640 AD concluded that water is the only soil component required for plant growth. We could go on and on. Again we find ourselves asking the question: How did Muhammad (pbuh) know that all living creatures are created from water centuries before mankind discovered this fact through scientific experimentation? Did he randomly select an element from the countless billions of possible choices? Why did he not claim that mankind was created from air, or from wood, or from light? Why water?