Acetylcholine
since rats are mammals, they are most definitely vertebrates.
They are Vertebrates, most of them have a spine which puts them in the vertebrate category!
they dont have a backbone
Most likely they are living things.
Vertebrates have an internal skeleton and invertebrates have external skeletons. Vertebrates are able to grow larger than invertebrates because of this. Invertebrates would crush themselves under their own skeletons if they grew to a large size.
most invertebrates are arthropods, and 70% of animals in the world are arthropods (insects), so I'm guessing there are more invertebrates than vertebrates.
Dugongs are vertebrates. Most invertebrates are usually small.
Vertebrates have vertebra.Invertebrates don't.
Since they are vertebrates, they are most closely related to fish.
Glutamate
salt
The group with the most species is that of the arthropods - insects, arachnids and crustaceans. But molluscs and the three groups of worms also make up a good part. Vertebrates is just another group like the arthropods for example - "invertebrates" is incredibly general. There are way more invertebrates than vertebrates.