Here's why:
* Solvent: Water is a universal solvent, meaning it can dissolve a wide range of substances. This allows for chemical reactions to occur within cells and for nutrients to be transported throughout the body.
* Transport: Water is the medium for transporting nutrients, oxygen, and waste products within the body.
* Temperature Regulation: Water has a high specific heat capacity, meaning it can absorb and release a lot of heat without drastic temperature changes. This helps regulate the internal temperature of organisms.
* Structure: Water is a key component of many biological structures, such as cell membranes and tissues.
* Lubrication: Water acts as a lubricant in joints and other body parts, reducing friction and allowing for smooth movement.
The percentage of water in an organism varies depending on the species, age, and other factors. However, water is a fundamental requirement for all living things.
