Some Animals with Backbones and Without Backbones

Vertebrates
Animals with backbones are called vertebrates. Examples include fish, frogs, lizards, birds, and mammals like humans and dogs.
A simple way to remember them is:
Fish.
Amphibians.
Reptiles.
Birds.
Mammals.

Invertebrates
Animals without backbones are called invertebrates; they include groups such as arthropods, mollusks, annelids, cnidarians, echinoderms, flatworms, and nematodes 
What "invertebrate" means

Definition: An invertebrate is any animal that lacks a vertebral column (backbone). 
Diversity: Invertebrates make up the vast majority of animal species on Earth and occur in almost every habitat, from deep oceans to soils and the air. 

Major invertebrate groups (examples and key features)
Arthropods — insects, spiders, crustaceans; characterized by jointed legs and usually an exoskeleton. 

Mollusks — snails, clams, octopuses; typically soft-bodied, many have shells though cephalopods (octopus, squid) do not. 
Annelids — segmented worms like earthworms and leeches; bodies divided into repeating segments. 

Cnidarians — jellyfish, corals, sea anemones; two cell layers and specialized stinging cells. 
Echinoderms — starfish, sea urchins, sea cucumbers; marine animals with radial symmetry and a calcareous endoskeleton. 

Platyhelminthes (flatworms) — planaria, tapeworms; soft, flattened bodies, often parasitic. 

Nematodes (roundworms) — threadlike unsegmented worms, many microscopic, some parasitic. 

Why invertebrates matter
Ecological roles: pollinators, decomposers, predators, prey, and ecosystem engineers (for example, earthworms changing soil). 
Human relevance: sources of food (shrimp, mussels), disease vectors or parasites (some nematodes, flatworms), and subjects in research and biotechnology. 


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