All of the following are evidence that a chemical reaction has occurred except
a. color change
b. formation of a precipitate
c. bubbles of gas
d. all of the above are evidence of a chemical reaction

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

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.