Which of the following about frogs is incorrect?

They belong to class Amphibia

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They lay eggs in water

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They breathe through gills in water

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They have a three-chambered heart

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Solution

The correct option is C They breathe through gills in water
The organisms that live a dual life, aquatic in larval stage and terrestrial in adult are known as amphibians. Frogs are amphibians. They lay eggs in water. They have a three-chambered heart. When the frog is out of water, mucus glands in the skin keep the frog moist which helps absorb dissolved oxygen from the air. A frog may also breathe much like a human, by taking air in through their nostrils and down into their lungs.

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