Please help

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Can someone list any possible solutions to air pollution ?

Topographic maps are used to measure a-composition b-movement c-elevation d-texture

Which statement about portugal is not true? a. it granted independence to its last colony in 1975 b. it has avoided conflict with spain c. it was a leader in european world exploration in the 1400s d. its economy is changing from agricultural to industrial b. it has avoided conflict with spain