Answer:
Pros: it allows for interest group who represent a small group of people to have a say in legislation with enough funds.
It allows politicians become aware of certain issues with small groups of people within their region which they represent.
It can be free to participate for the individual in an interest group, or a small yearly fee.
Cons: Based on the needs of the minority party, since the majority does not need more votes to pass legislation, they technically do not need lobbyists.
It can only be effective for specific groups, lobbying costs money, the more resources the more lobbying power you have.
Lobbying is considered nearly borderline illegal by most, since sometimes interest groups make donations to a politicians campaign