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a
The walls of diatoms are easily breakable.
b
'Diatomaceous earth' is depositions of the cell wall of diatoms.
c
Diatoms actively float on the surface of oceans.
d
Their walls are embedded with calcium oxalate.
answer is B.
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Detailed Solution
Diatoms are microscopic and float passively in water currents (plankton). The walls are embedded with silica and thus the walls are indestructible. Accumulation of cell wall deposits over billions of years in their habitat forms ‘diatomaceous earth’.