The mood changes from this outrageous romantic story because of how much they loved eachother, and how they risked faking their deaths for one another. Then it finally lead the mood into a tragedy due to their actual deaths, and how broken and connected everyone became in the end.
This is not an independent clause: it is dependent on the main phrase here, which is "<span>Most of these animals stay under water".
The underlined clause tells us something about why they must stay under water; and sentences that tell us about the why are called the "adverb clauses" - the correct answer.
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Summary:
This story can be summarized as a mystical tale about the reincarnation of a deceased soul who takes on a living form and assists a birth in another "living form".
An object complement (also called an objective complement) follows a direct object. It may be a word or phrase that gives further meaning to the direct object. ... An object complement can be a noun, pronoun, or adjective. Object Complement Examples: He made her happy.
no it is not