Because it needs to protect against predators.
Echinodermata comes from the term echino which means "spiny" and derm derives from the root "skin" so therefore, the phylum echinodermata means "spiny skin"
spiky skin, hard scales shark
Echinodermata
The spines sticking out of their delicate skin account for their name.
it has spiky skin with bubble gum on their spikes
Echinodermata is derived from Greek, ultimately from the words "echino" (meaning "sea-urchin" - originally "hedgehog"), and "derma" (meaning "skin").
The phylum name Echinodermata means "spiny skin," derived from the Greek words "echinos" (spiny) and "derma" (skin). This name refers to the presence of spiny, calcareous skin covering the bodies of echinoderms, including sea stars, sea urchins, and sand dollars.
Star fish belong to the Phylum Enchindodermata Latin for "Spiny Skin". A phylum is the classification right under Kingdom. Star fish belong to the class Asteroidea which is Latin for "Starlike."
Echinoderma are a phylum of "spiky skin" sea life, such as starfish, sea urchins, and sand dollars.
The symmetry of the larvae of echinodermata is bilateral.
No, "spiky" is an adjective used to describe something having spikes or sharp points, like a spiky hairdo or a spiky cactus. It is not a verb.
No, while crabs are indeed invertebrates thy have a carapace not a skin.