Eyes on stalks, a hard shell covering the back and other limbs, two front-positioned claws, 6 (?) legs.
A crab has an external hard shell, and is an invertebrate.
hard shells
Black widows external features are, they are black with a red hour glass on its back.
The skeleton and shell of a crab are synonymous. What we'd call the shell of a crab is simply a component of its exoskeleton, the external covering arthropods use made out of a tough protein, chitin.
A horseshoe crab is an invertebrate. It lacks a backbone or spine, which are characteristic features of vertebrates.
An Exoskeleton - external skeleton. Stops it getting omnomed
Some examples include: shrimp, crab, lobster, barncles, and prawns.
Thanksgiving
Hermit crabs are often distinguished by their bright red coloring. Interestingly, the intensity of the red is influenced by what the crab eats.
Mammals have several different external features that make them different from other animals. Some of these features include body hair or fur, external mammary glands, and warm-bloodedness.
its an external scope
They providestrength and support for the body.