Astudy in the 1990s found that residents of mexico city had higher levels of lead and cadmium in their blood than did residents of any other urban area in the world.
what is the most likely explanation for this?
a) diet
b) heredity
c) air pollution
d) water pollution

either wyoming or idaho

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.

answer; majority;