What does the chamber represent in the raven?

What do we call a two-syllable metrical foot that consists of one unaccented syllable followed by an accented syllable? a. anapest b. dactyl c. iamb d. elision

Read the sentence from the war of the worlds. i turned, and as i did so the screw must have come out, for the lid of the cylinder fell upon the gravel with a ringing concussion. which option is the accurate synonym of the word concussion as it is used in the sentence? explosion disruption crash interruption

Someone is calling us change into passive voice