How do you start a explanation during a essay

Your introduction should tell what you are going to explain and why you chose it as your topic. For example, if I was writing an essay on World War Two, In the introduction I would talk about what I will explain further into the essay and say why I chose that certain topic!! Hope this helps :)

This is what i found on google “the first mobile phone call was made 40 years ago today. on april 3, 1973, motorola employee martin cooper stood in midtown manhattan and placed a call to the headquarters of bell labs in new jersey.” i hope this you for what your looking.