Erns in Nature: Sea Urchins Sea urchins nestled in a Pacific kelp bed off California offer a sharp contrast in shapes between kelp tendrils and urchin spines.
海胆的巢穴在一片太平洋的海藻床离开加利福尼亚提出清楚的对比在外形在卷须海藻和海胆刺状突起之间。
Erns in Nature: Sea Urchins Sea urchins nestled in a Pacific kelp bed off California offer a sharp contrast in shapes between kelp tendrils and urchin spines.
海胆的巢穴在一片太平洋的海藻床离开加利福尼亚提出清楚的对比在外形在卷须海藻和海胆刺状突起之间。
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