having no backbone
Excludability
A free-rider problem.
A free rider problem
They have bilateral symmetry and are invertebrates.
A nail or hoof or claw are common to all mammals and are a shared evolutionary trait.
no it isn't all sea animals are vertebrates only turtles are invertebrates but they have a backbone too.
All phyla contain invertebrates. The only one that contains vertebrates is the phylum Chordata, but it also contains some invertebrates.
They both have a spinal cord protected by vertebrae. That is the key trait of all vertebrates. So whales and sharks are both vertebrates.
They are invertebrates
No; woodlice are crustaceans, which are invertebrates.
No beetles have bones. Therefore no beetle has a backbone. Only vertebrates have backbones. That means that ALL beetles are invertebrates.
arachnids, arthropods etc all animal are invertebrates unless if they are a mammal, reptile, bird, amphibians or fish