an antibiotic that attacks the lps layer would be expected to have a broad spectrum of activity, effective against gram negative and gram positive cells.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

it's not c. i took the quiz and got it wrong. so my best guess is b.

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