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The frog's back legs are shown below. They are the muscular limbs with a brown pattern on them. The frog's back legs are muscular for the purpose of jumping. Plus, their feet are webbed for the purpose of being able swim in lakes, ponds, etc, which are frog's habitats.

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External Characteristic #2 | Tympanic Membrane

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External Characteristic #2 | Tympanic Membrane

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The tympanic membrane is shown in the image below. The tympanic membrane is the gray circular patch of skin right below/to the side of the eye. The purpose of it is that it transmits sound waves to the middle and inner ear. This allows the frog to hear out in the air and below water.

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What is shown in the picture below is the frog's tongue on top of the bottom jaw. The tongue is flat and tan colored. The tongue is a muscular structure that is connected to the front of the mouth. It is extended to catch the frog's food, such as insects.

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What is shown in the picture below is primarily the frog's stomach. This is the long, tan cylinder shown in the image. The purpose of the frog's stomach is to store food and mix it with enzymes in order to begin digestion.

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What is shown on the picture below is the frog's lungs. These are the dark, fleshy organs in the image. The purpose of the frog's lungs are to allow the frog to take part in respiration. In other words, they developed these lungs, even though as young they had gills, and proceed to take in oxygen and emit carbon dioxide.

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External Characteristic #3 | Frog's Skin

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External Characteristic #3 | Frog's Skin

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The frog's skin is shown below with its brown pattern. The skin of a frog helps the frog have moisture instead of from swallowing water. Plus, the frog absorbs oxygen through their skin. However, the skin must always be moisturized in order for it to be able to absorb oxygen.