-logy suffix or -ology suffix means "the study of". A lot of fields in different types of sciences ends in -logy denoting particular fields of study. An example to prove such conclusion or theory would be biology, the study of life. Sociology is the study of human structure. Anthropology is the study of humans.
Using mobile phones has lots of advantages and disadvantages and most you will be aware of that. Earlier days, when we are out of home or office, we need to search for a public telephone booth to make a phone call, but now, just pick up your mobile phone and dial. I am trying to list the Pros and cons of using a mobile phone in this post. Advantages of using a mobile phone You are always connected, anybody who knows your mobile number can contact you. If you are travelling out of your territory...
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I think the answer is friends support each other despite their differences because the other answers don't make much sense to me.