Lengthwise, long bone growth during infancy and youth is exclusively through

The epiphyseal plates can be defined as the area of the growth present in the long bones. All the long bones grows by the interstitial growth of the epiphyseal plates.

The epiphyseal growth plate or the growth plate is present near the end of the long bones of the infants and the adolescents. It is a disc like structure made up of hyaline cartilage.

Hence, the correct answer is interstitial growth of the epiphyseal plates.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.