No, it means "jointed legs". ^^
Grasshoppers and crickets
Annelids are segmented in much the same way as arthropods (think of earthworms). Primitive arthropods include centi- and millipedes, with many unspecialized legs (legs in more advanced arthropods often specialized to form antennae, mandibles and pedipalps), and they're as long and thin as segmented worms. Also, there's a possible 'intermediate form', Peripatus, the velvet worm, being long, thin and soft-skinned, but also having many stubby legs!
Well, actually, arthropods don't have jaws, but I know what you mean. Arthropods have mandibles. Mandibles open side to side, which is great for slicing and tearing!
no, i dont know what they are, but they are not arthropods
NO. Arthropods do not have a 4 chambered hearts.
their spiny skin
A sea cucumber is a soft-bodied animal, not a spiny-skinned animal.
A spiny skinned invertebrate is called a sand dollar. That is because they are are echinoderms (a type of invertebrate),
no
Echinoderm means "Spiny-Skinned" in Greek. For more information, look at "What does echinoderms mean in greek?"
Echinoderm is the scientific name for spiny-skinned animals. Spiny-skinned animals include sea urchins, sand dollars, brittle stars, starfish, and sea cucumbers.
Starfish
it lives in the sea
Hedgehog or porcupine
A spiny-skinned invertebrate that lives on the ocean bottom floor is called a sea urchin.
Echinoderms
Echinoderms