Answer :
I would say "Convergent evolution." Two types of organisms have converged (after perhaps separating) into a common way of life, from varying circumstances
Answer:
Option A , Convergent Evolution
Explanation:
In a convergent evolution, similar characteristics or traits develop in species belonging to different race or ancestry groups.
As in this case , Earthworms are invertebrates while caecilians are amphibians but they both have the ability to burrow, have slender long body and also live in similar habitat (i.e moist soil) . Both the species (i.e earthworm and caecilians) have different origination but they have adopted similar characteristics/traits.
Hence, option A is correct.