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Answer:
<em>1. had 13. is </em>
<em>2. was 14. was I'm new plz like : ></em>
<em>3. is 15. is</em>
<em>4. was 16. had</em>
<em>5. were 17. was</em>
<em>6. was 18. had</em>
<em>7. had 19. was</em>
<em>8. was 20. were</em>
<em>9. were 21. was</em>
<em>10. were 22. had</em>
<em>11. has 23. was</em>
<em>12. was</em>
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.