Social networking sites are changing the way that businesses
a. pay their employees
b. find potential employees
c. write expense reports
d. fire bad employees

The correct answer in this case is either b - find potential employees or also D - fire bad employees in worst case scenarios. It has already happened that an employee was fired because his employer found something he did not like about the employee on facebook. This was cause for him to fire him. On the other hand, the same is true of finding new candidates. 

The answer is c : ) hope this answered your question!

Ithink the dna sequences may vary but the amino acid sequences are identical.