B. identical body cells
hope it is helpful to you
Cellular organelles are the internal organs of a cell. They are responsible for keeping the cell alive. They do this by bringing in food for the cell, getting rid of waste, protecting and repairing the cell, and helping it grow/reproduce.
It is d because the law was passed around 1976 I am not sure but this is the best estimate
D. He controlled variables by studying one or two traits at a time