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https://www.britannica.com/animal/echinoderm/Form-and-function-of-external-features
Form and function of external features General features. Echinoderms have a skeleton composed of numerous plates of mineral calcium carbonate (calcite). Part of the body cavity, or coelom, is a water-vascular system, consisting of fluid-filled vessels that are pushed out from the body surface as tube feet, papillae, and other structures that are used in locomotion, feeding, …
https://study.com/academy/lesson/echinoderm-structure-skeleton-symmetry.html
Let's talk a bit more about how the skeletal structure and symmetry of echinoderms works. Echinoderm Skeleton Structure The interlocking plates of a sea urchin test.
https://www.britannica.com/animal/echinoderm
Echinoderm, any of a variety of invertebrate marine animals belonging to the phylum Echinodermata, characterized by a hard, spiny covering or skin. Beginning with the dawn of the Cambrian Period (542 million to 488 million years ago), echinoderms have a rich fossil history and are well represented by many bizarre groups, most of which are now extinct.
https://quizlet.com/193077426/echinoderms-flash-cards/
Echinoderms are not numorous and account for only about _____ percent of the world's living things Endoskeleton All echinoderms have an internal support structure called an ___________ composed of plates and spines
http://starfish.ch/reef/echinoderms.html
Echinoderms have tentacle-like structures called tube feet with suction pads situated at their extremities. These tube feet are hydraulically controlled by a remarkable vascular system. This system supplies water through canals of small muscular tubes to the tube feet (= ambulacral feet). As the tube feet press against a moving object, water is ...
http://www.fossilmuseum.net/Tree_of_Life/Phylum-Echinodermata.htm
Since most echinoderms have some type of calcareous support exoskeleton (actually often interlocking plates of calcium carbonate), there exists an extensive fossil record tracing echinoderm evolution. Yet, many aspects of their early evolutionary origins are confounded, such that the classification table below is but one of many interpretations ...
http://www.oceanicresearch.org/education/wonders/echinoderm.html
Many echinoderms can also form suckers on the ends of their tube feet. These suckers can be used to capture and hold prey, or to hold onto rocks in a swift current or tide. Interestingly, although most mature echinoderms are benthic (meaning that they live on the bottom), the larvae are usually planktonic with bilateral symmetry.
https://quizlet.com/6658448/science-ch-2-workbook-flash-cards/
Science Ch. 2 -- Workbook (4th grade) The Animal Kingdom. Terms in this set (104) True. True or False. Invertebrates make up the largest animal group on Earth. ... All echinoderms have a support structure inside their bodies, called a(n) _____. arthropods. Invertebrates with jointed legs and body sections are called _____.
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