<prompt> Ribs are developed from -CloacaSclerotomeEndodermal cloacaPrimitive gut  <response>: Ans. is b i.e., Sclerotome o Ribs are derived from lateral cells of sclerotome.Derivatives of paraxial mesodermo Paraaxial mesoderm is organized into somites which in turn gives rise toSclerotomes: Form axial skeleton including vertebrae, ribs and parts of neurocranium,Myotomes : Form all voluntary skeletal muscles of head, trunk and limbs,Dermatomes : Form dermis of skin, especially over dorsal regions. SCLEROTOME-SOMITELateral sclerotomeVertebral arch ribsDorsal sclerotomeSpinous processVentral sclerotomeVertebral bodyAnnulus fibrosusDERMOMTOYOMESkeletal muscleDemits 