Explanation
- A
Birds
Birds. Cicadas and pond skaters are not birds.
- B
Fish
Fish. Froghoppers are not fish.
- C
Insects
Insects. Cicada, froghopper and pond skater are all insects.
- D
Reptiles
Reptiles. None of the three is a reptile.
Summary. Official key is (c) insects. Cicadas and froghoppers are hemipterans; pond skaters (Gerridae) are bugs that walk on water. None is a bird, fish or reptile.
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