The crisis-mapping tool ushahidi: (1 point)
a) prevents two-way dialogue between people.
b) is only available in the united states.
c) shows that a free software product can have great value.
d) relies on people using their desktop computing power to others.

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.

the works of justice saves things/people

the works of service things/people

explanation:

that's the best i can word it. hope it !

answer; provide for the common defense: