How do lung cells and skin cells become
different?

it supports cell theory.it states that all living cells are made from cells

answer; /// i believe that the correct answer is; ///a combination of the birth and death

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.