Question

sort the words according to the meanings of their shared roots. similar echinoderm assimilate formation dermal dermatitis transform epidermis shape same skin

Explanation:

The root -form relates to shape (formation, transform). The root -simil relates to same (similar, assimilate). The root -derm relates to skin (echinoderm, dermal, dermatitis, epidermis).

Answer:

shape: formation, transform
same: similar, assimilate
skin: echinoderm, dermal, dermatitis, epidermis