I am a writer of poems short stories and short articles on the feeling of nature.
Animals have backbones.
Fishes:- Cold-blooded, breathe underwater using gills, not lungs, have scales and fins, lay many eggs.
Amphibian:- Cold-blooded, live both lands and water, webbed feet, breath with lungs and gills, moist smooth skin, four legs, lay many eggs.
Reptiles:- Cold-blooded, have scales, have dry skin, usually lay eggs, ear holes instead of ears, four legs, or no legs.
Aves:- Warm-blooded, have feathers and wings, lay eggs, have two legs, ear holes instead of ears.
Mammals:- Warm-blooded, have hair or fur, give birth to live young, mammals mothers nurse their young one with milk, breath with lungs.
Animals do not have backbones. Do not have an internal skeleton made of bone. Many invertebrates have fluid filled, hydrostatic skeleton like jellyfish or worms, and others have outer shells, like insects and crustaceans.
Annelids:- Bodies divided into segments have very well-developed internal organs, found anywhere in the world, don't have limbs, eg. earthworms, leeches, roundworms.
Mollusks:- Have soft skin like organs covered with a hard outside shell, live some on land, like a snail, slug, some are living in the water like oyster, mussel, clam squid and octopus.
Echino terms:- Marine animals have arms or spines that radiate from the center of their body, like a sea star, sea urchins, sand dollar, and sea cucumber.
Protozoa:- Simple single-celled animals, smallest of all animals, microscopic, they breathe, move and reproduce like multi-celled animals, like amoebas, flagellates.
Arthropods:- Have limbs with joints that allow them to move, also have an exoskeleton, which is a hard, external skeleton, like crustaceans and insects, arachnids.
© 2021 Debashis Baruah