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Which of the following represents the correct combination of a taxonomic group with its characteristics, without any exception?
Group Character 1 Character 2
1 Reptilia All are terrestrial Crawling mode of locomotion
2 Chondricthyes Placoid scales Electric organs
3 Amphibia Tympanum Two pairs of limbs
4 Mammalia Mammary glands Direct development

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answer is D.

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Detailed Solution

All mammals possess mammary glands and undergo direct development.

Some reptiles are aquatic (e.g., sea snakes, turtles).

Electric organs are present only in some cartilaginous fishes (e.g., Torpedo); not all.

Some amphibians are limbless (e.g., Ichthyophis).

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