What key point/s did you get from source 1? source 2? source 3?source 1. What key point/s did you get from Source 1? Source 2? Source 3? Source 4?
2. What similarities and differences did you identify from the
sources​

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onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.