Blocklike masses that form from paraxial mesoderm and develop into muscle, axial skeleton, cartilage, and dermis are known as

The answer is somites and their subdivisions.   The vertebrae and ribs are formed from the sclerotome, the limb/trunk muscles from the myotome, and the dermis layer of skin forms from the dermatome. This segmentation and differentiation of the paraxial mesoderm occur in a rostral-to-caudal direction along the dorsal-ventral axis of the notochord.

b.have there own function.