means only those species with an external shell big enough that the soft parts can withdraw completely into it. those gastropods without a shell, and those with only a very reduced or internal shell, are usually known as slugs; those with a shell into which they can partly but not completely withdraw...
apple snails reflects their adaptation to habitats with oxygen poor water. this is often the case in swamps and shallow waters. the without thelung they would completely depend on their gills, which would decrease their ability to survive. another advantage of air breathing in combination with a shell...
apple snails reflects their adaptation to habitats with oxygen poor water. this is often the case in swamps and shallow waters. the without thelung they would completely depend on their gills, which would decrease their ability to survive. another advantage of air breathing in combination with a shell...
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icon map of reported cases timeline of reported cases previous outbreak investigation updates brote de infecciones por salmonella mapa de casos reportados cronograma de los casos reportados actualizaciones anteriores de la investigación del brote salmonella infections linked to gravel ridge farms shell...