1: Because they eat smaller creatures that live under the sea ice and sea ice is decreasing which leaves them with no food.
2: caused by humans.
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If you start counting in the usual way, with "one, two, three, ...", then as soon asyou say "eight" and keep going, all of the numbers that you say after that, until youget tired of it and stop, are all natural numbers greater than 8. You'll never completethe list, since there are an infinite quantity of them.
increments are the numbers that your going by on a line graph like ur going by 5's and so on
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There are 10,737,573 combinations and you must think I am mad if you think I am going to list them!
Draw a straight line and in the middle mark the zero position. Now make even marks leading away from that point. Call one direction positive numbers and the other negative numbers. Usually horizontal lines have positive numbers going to the right and vertical lines have them going up. Conversely down or to the left are negative numbers.