• # question_answer The total number of cells in the human body is at least A)  ${{10}^{3}}$              B)  ${{10}^{6}}$ C)  ${{10}^{9}}$             D)  none of these.

: The organism may be unicellular or multicellular. The cortex of the human brain consists of nine billion two hundred million cells. The human body consists of$30\times {{10}^{15}}$ cells.