The formation of photochemical smog is triggered by__a) sunlightb) ozonec) heatd) wind

The formation of photochemical smog is triggered by "sunlight" or option A. Sunlight is the ultimate source for produce and life. Photochemistry is the branch of chemistry concerned with the chemical effects of light. So in this case the main photochemical smog is triggered by sunlight since how that's what the branch studies in.

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Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.