Arrange the given taxonomic groups in increasing order of species richness: Fishes, Mammals, Insects, Reptiles
Answer: Mammals < Reptiles < Fishes < Insects
Explanation
To arrange the groups in increasing order of species richness (i.e., from fewest to most species), let's look at general estimates of known species:
- Mammals – ~6,400 species
- Reptiles – ~11,000 species
- Fishes – ~34,000 species
- Insects – Over 1 million described species (possibly several million undiscovered)
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