Composite Image made from various public domain images. Sources are below:
Sea Urchin image taken by "Extemporalist":
https://commons.wikimedia.org/wiki/File:Red_Sea_Urchin_by_Lawson_Harbour.png
Tree Trunk image taken by "www.Pixel.la Free Stock Photos":
https://commons.wikimedia.org/wiki/File:Forest-tree-tree-trunk-bark_(23698161444).jpg
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