Jellyfish are at least 95 percent water and range in seize from less than three centimeters to over two meters in diameter. Muscles propel many species along by rhythmically contracting and relaxing their bell-shaped body, somewhat like closing and opening an umbrella.
CONSIDER: scientist who study fluid dynamics have discovered that certain jellyfish, while not fast swimmers, have an intriguing method of propulsion. With each contraction of their body the animals create a doughnut shaped vortex, like a smoke ring, which they push away from themselves. The momentum of the ring creates an opposite reaction that propels the jellyfish forward, somewhat like a jet but with pulses of energy instead of constant thrust."it sounds very easy" says new scientist magazine. But the act off forming a vortex. ring has proved very difficult to model mathematically.
Researchers are studying the jellyfish's propulsion system in order to build more efficient underwater vehicles. One researcher has already developed a 1.2-meter-long submarine that creates a wake similar to that of the jellyfish. The vehicle used 30 percent less energy than a conventional propeller-driven unit. Another proper application involves the human heart.because the movement of blood within a section of the heart generates vortex rings, abnormal vortices may reveal early signs of heart disease.
WHAT DO U THINK? Did the propulsion system of the jellyfish come about by evolusion? Or was it designed?

Interesting.

God made it.