Question

fix the two words that are used incorrectly.

in 2014, the maven spacecraft entered martian orbit. it’s instruments were designed to measure the composition of mars’s atmosphere, according to paul mahaffy, whose an investigator for the mission.

Explanation:

1. "It's" is a contraction of "it is" or "it has" and is incorrect here. The correct possessive form for "it" is "Its" to show that the instruments belong to the MAVEN spacecraft.
2. "whose" is used to show possession related to a person or sometimes a thing in a relative clause, but in this context, the correct word is "who's" (contraction of "who is") or more appropriately, "who is" (but since we need to fix the word, "whose" is incorrect. The intended meaning is "who is an investigator", so "whose" should be replaced with "who's" or "who is", but as a single word fix, "whose" is incorrect and should be "who's" or adjusted. However, the two incorrect words are "It's" (should be "Its") and "whose" (should be "who's" or "is" but in the context, "whose" is wrong; the correct would be "who is" but as a single word, "whose" is incorrect. So the two words to fix are "It's" (change to "Its") and "whose" (change to "who's" or "is" but in the sentence, "whose an investigator" is wrong, so "whose" should be "who's" or "who is", but as a word to fix, "whose" is incorrect. So the two words are "It's" (replace with "Its") and "whose" (replace with "who's" or "is" but in the sentence, the error is "whose" – it should be "who is", so "whose" is wrong. So the two words: "It's" → "Its" and "whose" → "who's" (or "is" but as a word, "whose" is incorrect).

Answer:

1. "It's" should be "Its"
2. "whose" should be "who's" (or "who is", but as a word fix, "whose" is incorrect and should be "who's")