The scale on the eyepiece graticule cannot be used directly to measure the size of objects under a microscope's objective lens because each objective lens will magnify to a different degree
A double membrane that surrounds the nucleus. It controls the entry and exit of materials in and out of the nucleus and contains the reactions taking place within it.
A 3-dimensional system of sheet like membranes, spreading through the cytoplasm of the cells. It is continuous with the outer nuclear membrane. The membranes enclose a network of tubules and flattened sacs called cisternae.
The cells of a multicellular organism have evolved to become more and more suited to one specialised function. These cells are adapted to their own function and perform it more effectively
As a result, the whole organisms' functions efficiently