USA HISTORY

Detailed explanation-1: -1. a particular period of time marked by distinctive features, events, etc.

Detailed explanation-2: -The noun epoch is from New Latin epocha, from Greek epochē, “pause, check, fixed time.” Definitions of epoch. a period marked by distinctive character or reckoned from a fixed point or event. synonyms: era.

Detailed explanation-3: -: a fixed point in time from which a series of years is reckoned. : a memorable or important date or event. especially : one that begins a new period in the history of a person or thing. : a system of chronological notation computed from a given date as basis.

Detailed explanation-4: -Answer: The ERA is referred to as Electrical Replaceable Assembly. It is the part of electronic equipment in the computer which can be removed and replaced without the need to repair the whole system.

Detailed explanation-5: -period = A unit of time shorter than an era but longer than epoch. epoch = A unit of time shorter than a period but longer than an age. Archean = “Ancient” eon from 4, 500 Mya – 2, 500 Ma. Proterozoic = “Early life” eon from 2, 500 Ma – 540 Ma. Paleozoic = “Ancient life” eon from 540 Mya – 248 Ma.