AP Environmental Scienceeasymcq1 pt
PM2.5 is especially harmful because these particles
A.penetrate deep into the lungs and bloodstream
B.are too large to inhale
C.are always harmless dust
D.only affect plants
Explanation
Core Concept
Particles under 2.5 micrometers bypass the body's defenses, reaching alveoli and circulation — linked to heart and lung disease.
Correct Answer
Apenetrate deep into the lungs and bloodstream
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