Animals

Animals

1. Invertebrates

   • An invertebrate is an animal that does not have a backbone or an internal skeleton
   • live in water and on land
   • There are more than 1 million different kinds of invertebrates.
   • Invertebrates are divided into 12 phyla
     • Porifera (sea sponges) the simplest invertebrates of all animals. (aquatic creatures)
       • cnidaria (hydras, jellyfish, sea anemones and corals) Most cnidarians have arm-like structures called tentacles around their mouths.
         • annelids (earthworms) They live in water or damp soil, Their bodies are long, rounded, and divided into ring-like segments.
           • arthropods (crabs, spiders and insects) live in water and on land and some can fly They have a hard outer body covering and jointed legs
             • molluscs (octopus,mussels) are found on land or in fresh water,have soft bodies and are covered by a thin tissue called a mantle.
               • echinoderms (starfish) Echinoderms only live in marine ecosystem Echinoderms have a hard covering made up of hard skins and spines.

2. Vertebrates

   • All vertebrates belong to the phylum. They are called chordates.
   • Vertebrates have an internal skeleton that supports their bodies.
   • An internal skeleton is called an endoskeleton.
   • Vertebrates can be divided into five more groups: mammals, birds, fish, reptiles, amphibians.
     • Fish: are animals which have scales, and fins on the thorax, stomach, back and tail and they are tube-shaped. They can be carnivorous, omnivorous and herbivorous, There are two types: Cartilaginous fish and Bony fish,
       • Amphibians: Some of them lead two lives, the first is a life in water and the second is a life on land. They are carnivorous and oviparous. They need a lot of humidity to survive.
         • Reptiles:

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