How would you know if two organisms were closely related based off their DNA and amino acids?

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy

Can someone i have no idea of how to do this.