Identify the meter and length of the following line. "a bird came down the walk" meter: line length:

The meter of this line is iambic, which is used to refer to a poetry rhythm, in which each short syllable that is not stressed is followed by a long or stressed syllable. The length is trimeter, that means that its meter or line consists of three iambic feet.

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).

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