Gills and a well developed nervous system
legs.
Closed hydrovascular for echinoderms, open haemolymphatic for arthropods. ^^
Sponges, Cnidarians, Mollusks, and Echinoderms are not Arthropods.
The types of organisms which have segmented bodies include annelids, arthropods, echinoderms, and chordates. Some of the most obvious examples of segmentation are found in insects which belong to the arthropods.
A. Arthropods
sponges+mollusks+arthropods+worms+octopods+echinoderms
Gills and a well developed nervous system
Appendages.............in multiples of........numbers........and clouds
Lobsters are neither echinoderms nor mollusks like clams. They are also not arachnids. Instead, they are crustaceans, a subsection of arthropods.
Echinoderms are mostly marine while arthropods dwell in almost all habitats.
Spiders have 8 legs and 2 body parts.
No, a caterpillar is an Arthropod. There are over a million types of anthropoids on earth. Here are three things all arthropods have 1. Chitonous 2. Exoskeleton segmented body 3. Jointed appendages