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because they have no skeleton.
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∙ 12y ago
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What characteristic distinguishes arthropods and mollusks?
Mollusks compose of the large phylum of invertebrate animals known as the Mollusca. Mollusks have a mantle, mollusks invertebrate. Arthropods have jointed appendages, arthropods have segmented bodies
How are arthropods and mullusks the same?
Arthropods have an exoskeleton. Mollusks don't.
Are scorpions annelids flatworms mollusks arthropods cnidarians or echinoderm?
a scorpion is a Arthropods
How are vertebrates different from mollusk and arthropods?
Vertebrates have spinal cords. Mollusks and arthropods do not.
Which animal is not a arthopods?
Sponges, Cnidarians, Mollusks, and Echinoderms are not Arthropods.
The first land animals belong to which group A arthropods B echinoderms C mollusks D vertebrates?
A. Arthropods
Which groups of invertebrates are protostomes?
Flatworms, Roundworms, Annelids, Mollusks, and Arthropods
What is the groups of invertebrates?
sponges+mollusks+arthropods+worms+octopods+echinoderms
How many mollusks are there in the world?
There are over 50,000 known species of Mollusks! That figure makes them second only to the Arthropods in invertebrate phylum size.
Is a lobster a echinoderms or a mollusks?
Lobsters are neither echinoderms nor mollusks like clams. They are also not arachnids. Instead, they are crustaceans, a subsection of arthropods.
Is a grasshopper is invertebrate?
No. Grasshoppers are arthropods. Mollusks are usually aquatic, and do not resemble insects.
What internal structure is a functional part of an open circulatory system which is found in arthropods and mollusks?
coelum
