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disturbance- n. something that stops you from working, sleeping, etc.
indigenous - adj. produced, living, or existing naturally in a particular region or environment
marine - adj. of or relating to the sea or the plants and animals that live in the sea
motivate - v. to give (someone) a reason for doing something
pack ice - n. large pieces of floating ice that have come together
route - n. a way to get from one place to another place
tend - v. used to describe what often happens or what someone often does or is likely to do
