examine a variety of echinoderm species such as starfish, basket star, sand dollar, and sea cucumber

Name: examine a variety of echinoderm species such as starfish, basket star, sand dollar, and sea cucumber
Uploaded: 2023-10-10T02:29:43.693Z
Duration: 2 min 6 s

Echinoderms exhibit a variety of body plans. The starfishes are also called sea stars. Although they commonly have five arms, some can have many more. Basket stars have branched and coiling arms. Many brittle stars are quick and agile in comparison to most other echinoderms, especially the almost immobile sand dollar. Sea cucumbers are elongated soft-bodied echinoderms, while sea urchins are globular and spiny. The adult sea lily is sessile, using tentacles growing from its arms to feed.

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The banded sand snake (Chilomeniscus cinctus) is adapted to burrowing, and “swims” beneath the sand. The sidewinder (Crotalus cerastes) uses a different method of locomotion—sidewinding—to move along the sand's surface. Both snakes are found in North American deserts.

How Snakes Wind Through Sand
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Learn more about refraction.

How does refraction affect the direction of a wave?

$How does refraction affect the direction of a wave?$
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The land iguana (Conolophus), a species endemic to the Galapagos Islands.

Observe a land iguana, its burrow, and its herbivorous diet of cactus flowers, roots, and stems
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Learn about the tactic a queen triggerfish (Balistes vetula) uses to prey upon a sea urchin.

Watch how a queen triggerfish defeats a sea urchin's defensive tactics
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Learn how a traditional Greek dish of octopus and tomato sauce is made.

See how the traditional Greek delicacy of octopus and tomato sauce is made
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Learn about sea star reproduction by observing the release of eggs and sperm, egg fertilization, and development of zooplankton embryos and larvae.

Observe sea star reproduction, from egg and sperm release and fertilization to development of zooplankton embryos and larvae
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Anatomy and physiology of starfish tube feet.

Study how sieve plates and suction-cupped tube feet enable sea stars to catch prey and move through water