Which of the following animals is a ‘living fossil’?A) Limulus B) NeopilinaC) Both A and BD) None of the above

The correct answer is A) Limulus.

Limulus, commonly known as the horseshoe crab, is considered a "living fossil" because it has remained relatively unchanged for millions of years. These ancient creatures have existed on Earth for about 450 million years, and their physical appearance is very similar to fossils that date back to the Paleozoic era. Despite their name, horseshoe crabs are not true crabs but belong to a separate taxonomic class called Merostomata.

Neopilina, on the other hand, is an extinct genus of primitive mollusks known from the fossil record. Therefore, it is not a living fossil.

So, the correct answer is A) Limulus.