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

Moderate

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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