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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lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.