DENDROLOGY

Detailed explanation-1: -Invertebrate animals commonly called “worms” include annelids (earthworms and marine polychaete or bristle worms), nematodes (roundworms), platyhelminthes (flatworms), marine nemertean worms ("bootlace worms"), marine Chaetognatha (arrow worms), priapulid worms, and insect larvae such as grubs and maggots.

Detailed explanation-2: -Insects, annelids, mollusks, echinoderms, protozoa, crustaceans, and arachnids are all invertebrates.

Detailed explanation-3: -Invertebrates are the animals in our world without a backbone. You know a lot of them. The insects and crustaceans have outer skeletons, while the mollusks and the worms don’t have much of a skeleton.