Question

the water dog
in 2003, biologist luis zambrano was working at a lake near his home outside of mexico city. his job was to find and count a type of amphibian called an axolotl (pronounced ack-suh-lah-tul). he found it to be boring, tedious work, mostly because he wasnt catching many of them. but then it occurred to zambrano that he had uncovered a significant issue. this lake had once been teeming with axolotls, but now it barely had any. where have they all gone? he wondered.
axolotls are found only in a few freshwater lakes around mexico city. in the past, sightings of these creatures had been fairly common—so much so that the species became a symbol of mexican national pride. the aztecs (a historic culture native to mexico) gave these salamanders their name, which means water dog or water monster. according to aztec mythology, a god by this name transformed into a salamander in order to escape from harm. in modern times, the mexican painter diego rivera included the animal in at least one of his paintings. in 2021, mexicos central bank updated its fifty-peso bill to include a prominent image of the axolotl. the fact that this nationally celebrated amphibian seemed to be disappearing from the wild began to alarm many different groups of people, and researchers like zambrano worried that they might lose access to an animal whose unusual biology had long fascinated them.
to biologists who study amphibians, the axolotl is a salamander with truly astounding qualities. most amphibians start out with gills. then, as they mature, they develop lungs that allow them to survive on land. but the axolotl has characteristics of both a juvenile and an adult—feathery gills and lungs. scientists arent sure why it has developed this way, and the axolotl is the only known salamander to have done so.
in addition to being an object of fascination for biologists, the axolotl is also of interest to medical researchers. from a medical perspective, the most unusual thing about the axolotl is its regenerative ability. when most animals are wounded, they form scar tissue that eventually heals. the axolotl, though, doesnt form scar tissue. instead, the cells around the missing part (be it a limb, a spine, or even parts of the brain) work together to actually regrow it. because of this phenomenon, scientists estimate that axolotls are significantly more resistant to cancer than humans. wouldnt it be amazing if this miraculous ability could be developed into treatments for human diseases and injuries? thats exactly what some scientists are trying to do, and with continued access to the axolotl, they might one day succeed.
after studying the mystery of the declining axolotl population, zambrano and other scientists determined that water pollution was the likely culprit. mexico city is one of the largest metropolitan areas in the world, and pollution in nearby lakes has increased as the city has grown. but there has been some immediate good news: conservationists have begun working with farmers to create pollution-filtering islands to help clean the citys lakes. after much research, scientists have concluded that these efforts have begun to make a difference, but they also stress that more needs to be done in order to revive the dwindling axolotl population. for zambrano and his fellow researchers, saving this unique species of salamander is worth the effort.
based on the clues in the text, what is the most likely reason why the axolotl is a recurring image in mexican culture?
it is considered one of the most beautiful amphibians on earth.
it is a beloved symbol of their country and has ancient cultural roots.
it is celebrated for providing healing medicine for many people in mexico city.

Explanation:

The text states that axolotls were once common enough to become a symbol of Mexican national pride. The Aztecs (a historic culture native to Mexico) named them, and their name has cultural and mythological significance. This shows its status as a beloved national symbol with ancient roots.

Answer:

It is a beloved symbol of their country and has ancient cultural roots.