even viruses have to enter a functioning cell with water in it, for them to take over the nucleus and copy themselves.
all cells require a fluid medium to move biological molecules from place to place, and carry out the functions of cellular metabolism.
A kangaroo rat can and does; anyway it does not drink water. It does not even eat juicy foods. It eats seeds. It produces and conserves its own metabolic water in the process of respiration.
We also make water in the process of respiration, but our bodies do not conserve it. We sweat, pant, and pee too much.
A kangaroo rat does not sweat or pant to cool itself. It burrows underground in hot weather, and comes out at night. It has a lot of hairs in its nasal passages that collect water droplets that might be breathed out the nose. And it produces only a very small amount of urine.
Not on earth with our forms of life. Perhaps on another planet.
But there are life forms that life on VERY TINY amounts of water in the Mohave Desert for example. They have evolve ways to conserve water in amazing ways. For example, the water vapor in your breath would be a feast for them.
Not exactly. However, the kangaroo rat doesn't need to DRINK water. It gets all it needs by metabolizing its food.
