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Which species is most commonly found in aquatic cages in a lab setting?
Xenopus laevis (African clawed frog)
Savannah monitor lizard
Cuttlefish
Golden hamsters
The correct answer is: Xenopus laevis (African clawed frog)
The African clawed frog, scientifically known as Xenopus laevis, is indeed the species most commonly found in aquatic cages in laboratory settings. This amphibian is widely utilized in various types of research, including developmental biology and toxicology, due to its ease of handling, well-characterized genome, and the availability of established breeding protocols. Its habitat needs for aquatic environments and its adaptation to such conditions further facilitate its maintenance and study in laboratory settings. In contrast, the other species listed have different habitat requirements that do not align with being housed in aquatic cages. The Savannah monitor lizard is a terrestrial reptile, while cuttlefish, although aquatic, are typically housed in more complex marine environments and require specific conditions for health and welfare. Golden hamsters, being terrestrial mammals, are typically housed in cages designed for land-dwelling animals. Thus, the characteristics and research applications of Xenopus laevis make it the most suitable choice for aquatic lab environments.