<span>a word, letter, or number placed before another.</span>
Answer:
opal
Explanation:
Although you have not submitted the excerpt to which the question refers, the word that makes the reference quoted in the question is "opal." Opal is a gem that presents many points of color change in light and dark tones, completely random. This gem is constantly associated with the inconstancy of human feelings and was used by Shakespeare exactly to present the inconsistent nature of Orsino.
The sentence that correctly forms the possessive noun is the first one - Amber and Lucas's trainers were both gold medal winners.
Eli Whitney was who invented the Cotton GIn
