Question

fix the two words that are used incorrectly.

my colleague is working on an exciting new book. its about the
life and legacy of king richard iii, a controversial ruler whos
five-hundred-year-old skeleton was found in england in 2012.

Explanation:

1. "Its" is a possessive pronoun, but here we need the contraction "It's" (It is) to introduce what the book is about.
2. "who's" is a contraction of "who is", but we need the possessive pronoun "whose" to show that the skeleton belongs to King Richard III.

Answer:

1. Replace "Its" with "It's"
2. Replace "who's" with "whose"