Biographers consult multiple sources before writing

Because they want to write an objective account. They write true stories, so they need as much information as it is possible to gather. If they used only one source, it wouldn't be a believable, authentic, and true story. Opposing or contradictory views are a valuable piece of information to include in a biography. They show the controversies of an age, not just various personal accounts about someone.

you can give away as many points as you want i usually only go with 10

Explanation: