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This developing flower displays the spiral form in two aspects: The whole flower begins in a spiral and unfolds as it opens, while the tips of the petals form tiny inward spirals.
The nautilus is a cephalopod, like the octopus and squid. Unlike some animals in this class, it has a hard outer shell, which is divided into chambers. As the nautilus grows in size, it periodically seals off the shell behind it and creates a new, larger chamber to live in. This ongoing process creates the familiar spiral structure that is visible when a nautilus shell is sliced in half.
The 6-inch PAX Scientific impeller can mix 4 million gallons of water using only 150 watts.