Answer:
1. 0 it is the good reprensentation of sea level..
2.use a verical line
3. 3 ft. Above the sea level..
4. 4 ft. Above the sea level..
5.5 ft. Below the sea level..
6. 9 ft is the distance between the cliff and the crab..
7. 10 ft.is. The distance between the bird and the crab..
Explanation:
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