math question

Identify a" sampling techniques and forms of bias found in the survey described below: Mayor John Tory's reelection team decide to poll Toronto residents about the local issues that are most important. The team chose 6 retirement homes from the different regions of Toronto: Etobicoke, York, North York, East York, Old Toronto, and Scarborough. The survey was sent by email to every resident in the building. "Please let us know which of Toronto's most pressing issues you want to be changed first\" Describe how the survey strategy could have been improved to eliminate bias