They need energy to produce oxygen
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There are four main characteristics of ethos:
Trustworthiness and respect.
Similarity to the audience.
Authority.
Expertise and reputation/history.
Hibernate because when they sleep they don't use any calories so thus,they can survive the winter without waking up for food. This is because also their metabolism slows down so much that it consumes little to no calories a hour keeping its vitals stable and not having to wake up to ''refuel" it's self.