Nhận biết (M1)

The axolotl, a salamander native to a few lakes near Mexico City, has long fascinated biologists for its ability to regenerate lost limbs, portions of its heart, and even parts of its brain. Unlike most amphibians, it never undergoes metamorphosis, retaining its juvenile, aquatic form throughout life. Researchers now suspect that this retention of juvenile traits is linked to its extraordinary regenerative powers, and studies of axolotl genetics may eventually inform efforts to enhance tissue regeneration in humans.

Which choice best states the main idea of the text?

• A.

  The axolotl is the only amphibian capable of regenerating brain tissue.

• B.

  The axolotl's unusual biology makes it a valuable subject for regeneration research.

• C.

  The axolotl's habitat near Mexico City is increasingly threatened by development.

• D.

  Metamorphosis is responsible for the limited regenerative abilities of most amphibians.