DNA analysis is the process in which genetic sequences are studied. It is used by law enforcement and medical personnel to identify a particular person or species, and even specific cancers and diseases. At one point the analysis process was very limited.
To round off to the nearest tenth, means to keep one decimal digit. (To round off to the nearest hundredth would mean to keep two digits; to the nearest thousandth, three; and so on. Now, the digit in the second decimal place is 5. Therefore add 1 to the previous digit 2.
o You don't want the person you are calling to see that you've called them 10 times in a row. o You don't know the person you are calling and don't want them to have access to your number. o You are calling a business or an unknown number and don't want them to know your number. If you decide that you would like to keep your cell phone number a secret, you will need to block your number.