When you compare the genome of one individual to another, you will find that

The previous answer is incorrect all human DNA is 99% identical

Explanation:

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.

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.