How do most sessile and burrowing mollusks obtain food?

answer:

marine species live mainly in shallow coastal waters. gastropods use their foot to crawl slowly over rocks, reefs, or soil, looking for food. bivalves are generally sessile filter feeders. they use their foot to attach themselves to rocks or reefs or to burrow into mud.

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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).