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Biology (Amphibians : Joud Alburaidi (As larvae they have gills and as…

- - - - Shelled amniotic egg
      - Scaly skin
      - More efficient circulatory and respiratory systems
  - - - An amniotic egg is covered with a protective shell and has several internal membranes.
      - The amnion is a membrane that surrounds a developing embryo.
      - The leathery shell protects the internal fluids and embryo.
  - - - Respiration
        
        Reptiles depend primarily on lungs for gas exchange.
        
        A reptile’s lungs have a large surface area.
        
        With more oxygen, more energy can be released through metabolic reactions and made available for more complex movements.
  - - - Reptiles have internal fertilization.
      - After fertilization, the egg develops to form the new embryo and an amniotic egg.
      - Most reptile eggs are buried and the sun incubates them.
      - After laying their eggs, most females leave them alone to hatch.
- - - - Sharks belong to class Chondrichthyes.
      - Have strong swimming muscles and sharp teeth.
      - Sharks are one of the top predators in the sea.
      - Most sharks have streamlined shape.
      - They can detect chemicals in the water, that allow them to detect prey.
      - They have lateral line to detect vibrations in the water.
    - - They are the largest living sharks.
      - Are filter feeders with specialised straining structures in their mouths.