The cell membrane or cell wall
Yes, for a prove :
" <span>On Friday morning (March 6), NASA's Dawn spacecraft will arrive at Ceres, becoming the first probe ever to orbit a dwarf planet. Ceres is the largest object in the asteroid belt between Mars and Jupiter, and the closest dwarf planet to Earth" - google ...
CAN THIS MAYBE HELP ?
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Answer:
Estuaries filter out sediments and pollutants from rivers and streams before they flow into the ocean, providing cleaner waters for humans and marine life.