In this video, someone appears to step directly onto a sea urchin with a bare foot, causing an instant shock reaction. The spines press into what looks like real skin, making it almost painful to ...
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In sea urchin and salmon sperm, pH value regulates whether they remain immotile or swim
A study by the Max Planck Institute for Multidisciplinary Sciences and the University of Bonn has shown that pH value is crucial for sperm motility in sea urchins and salmon. An increase in pH ...
13.5 x 11.25 in. (34.3 x 28.6 cm.) ...
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