Earthworms, which are land invertebrates, and caecilians, which are amphibians, have evolved with traits that enable them to burrow; both live in moist soil and have an elongated and slender body. which evolutionary mechanism do they represent? a- convergent evolution b- adaptive radiation c- reproductive isolation

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.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.