DENDROLOGY

Detailed explanation-1: -An invertebrate is a cold-blooded animal with no backbone. Invertebrates can live on land-like insects, spiders, and worms-or in water.

Detailed explanation-2: -Animals without backbones are called invertebrates. They range from well known animals such as jellyfish, corals, slugs, snails, mussels, octopuses, crabs, shrimps, spiders, butterflies and beetles to much less well known animals such as flatworms, tapeworms, siphunculids, sea-mats and ticks.

Detailed explanation-3: -Invertebrates are those organisms that lack a spine or back bone. They evolved before vertebrates and are generally a simpler form of life having a simple notochord or simple nervous system. The support and structure that comes from the backbone come from other structures in invertebrates.