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Biological Evolution: Unity and Diversity: Vertebrates and Invertebrates
Echinoderms I
Description
Echinoderms I
Echinoderms are marine animals such as sea stars, sea urchins, and sand dollars. They are invertebrates but have an internal skeleton made of calcium plates, giving them support and protection. They also have a unique water vascular system that powers tiny tube feet...
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Transcript
Have you ever seen a sea star at the beach? These, along with sea urchins and sea cucumbers, belong to the echinoderm group.
Echinoderms show radial symmetry, with their body parts arranged around a central point. Their bodies are covered in spiny skin, supported by tiny skeletal plates.
They move, feed, and breathe using a water vas...
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