When diana transitioned from elementary school to middle school, she moved from being one of the oldest, biggest, and most powerful students in the elementary school to being one of the youngest, smallest, and least powerful students in the middle school. this phenomenon is known as the?

This is known as the Top-dog phenomenon.

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.