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Amphibians

  Frogs, toad, newts, and salamanders are amphibians.  They are mostly land animals, but their lives are tied to the water.  Amphibians lay their eggs in water and they develop into tadpoles, which swim and have gills to breathe.  Later the tadpoles develop legs, lose their gills, and develop lungs.   Now as tiny frogs or newts, they move to the land.  But even then, they mostly stay in damp places, because their smooth, slimy skins are not waterproof.  The advantage of these skins is that they can be used for breathing and help out the simple lungs.

  Over 350 million years ago some lobe-finned fish lived where pools sometimes dried up.  They had to wriggle to the next pool to survive.  Eventually some became better adapted for making these trips.  The fins turned into legs.  The breathing of air became important.  Amphibians had arrived.  The head of amphibians differs from that of fish.  Amphibians have eyes with tear glands and eyelids.  They blink to clean the surface of the eye.  Fish have internal ears and hear well.  On land something more is needed to pick up sounds in air.  Amphibians have eardrums at the back of the head.  Frogs depend upon sound to attract a mate.

  Newts probably look most like the early amphibians.  Toads and frogs are relatively new, but they are very successful, especially in the tropics.  There are 3,500 species of toads and frogs compared to about 500 other amphibians.

 

Answer the questions below

 

1. Amphibians are mostly
 

water animals, but their lives are tied to the land.

water animals.

land animals, but their lives are tied to water.

 

2. Amphibians use gills to .

 

3. have internal ears and hear well.

 

4. Amphibians to clean the eye surface.

 

5. Which of the following looks most like the early amphibians?
 

newts

tadpoles

frogs

 

6. Amphibians have eardrums located at the back of the .

 
7. There are about species of of frogs and toads.
 
8. Which of the following uses sound to attract a mate?
 
frogs

salamanders

toads

 
9. Over 350 million years ago lobe-finned fish began to adapt to the changing environment.  What does adapt mean?
 
to remain the same

to move to a new location

to adjust and change

 
10. Amphibians have smooth, slimy skins that are not .

 

 

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