Correct option is (D) 60 cm3
Base of square pyramid is a square of edge 6 cm.
\(\therefore\) Base area \(=6^2=36\,cm^2\)
Height of pyramid = 5 cm
\(\therefore\) Volume of square pyramid \(=\frac13\times\) Base area \(\times\) Height of pyramid
\(=\frac13\times36\times5=12\times5\)
\(=60\,cm^3\)
The pyramid of biomass in sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton and the number of big fishes eating the small fishes is...