From a Hercules beetle tough natural armor to a sea anemone’s soft fluid-filled body, nature boasts a variety of skeletons. A circa-1910 x-ray photograph of pot-bellied seahorses shows their ...
Sponges may be ancient, but their timeline has been murky. New research suggests the earliest sponges were soft and skeleton-free, explaining why their fossils don’t appear until much later. By ...
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