answer the following
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1.Class:Amphibia
2..In general, frogs have protruding eyes, no tail, and strong, webbed hind feet that are adapted for leaping and swimming. They also possess smooth, moist skins. Many are predominantly aquatic, but some live on land, in burrows, or in trees. A number depart from the typical form.
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a) This is a picture of frog. It is included in Class - Amphibia.
b)
1. These animals are strictly aquatic during larval life and perform only aquatic respiration whereas they can live in water as well as on Soft sk land during adult life and can perform aquatic as well as aerial respiration.
2. They have two pairs of appendages. Digits are without claws.
3. Exoskeleton is absent. Skin is without any derivative and usually kept moist for
respiration
4. External ear is absent but tympanum is present.
5. Neck is absent. Eyes are prominent with eyelids.
Ex.: Frog, Toad, Salamander, etc.
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