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(B:value, bussal threads, gills, digestive sustem, heart, siphon, foot,…
B:value
mother of pearl
2 shells
exoskeleton
hinge
bussal threads
inter tidal zone
waves
counect torock
gills
oxygen
digestive sustem
stomach
filter feeder
seawweed
algae
heart
siphon
foot
mantle
closing muscle