Imagine being a sea creature without the ability to swim! Sea urchins live on the seafloor and use their tube feet to move around. According to @whoi.ocean, their feet are controlled by a water vascular system. By changing the amount of water inside, sea urchins can extend or contract their feet for relatively speedy mobility. For protection, their spiny shell (called a ‘test’) wards off predators craving ‘uni,’ the edible part of an urchin. Sea urchins have been found in fossil records as far b
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Imagine being a sea creature without the ability to swim! Sea urchins live on the seafloor and use their tube feet to move around. According to @whoi.ocean, their feet are controlled by a water vascular system. By changing the amount of water inside, sea urchins can extend or contract their feet for relatively speedy mobility. For protection, their spiny shell (called a ‘test’) wards off predators craving ‘uni,’ the edible part of an urchin. Sea urchins have been found in fossil records as far b
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