According to paragraph 4, Barbara Jordan’s presence at the convention is evidence of what symbol?

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Explanation:

according to archimedes principle, volume of water displaced = volume of water.

hence volume of rock is = 1.65l or 1650 cm^3

explanation:

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).