Which statement is true? A) Cells come in different shapes, but are all about the same size—very, very small. B) Cells come in different shapes and different sizes. C) Cells all have the same shape, but come in different sizes. D) Cells are all the same shape and size—small and rounded.

B) Cells come in different shapes and different sizes.

Explanation:

Cell is the basic unit of life. Each cell forms the an integral component of the body of the living organism. The cell structure and function varies from organism to organism. The cells of the plants are comparatively larger than the animal cells. The plant cells are usually rectangular in shape whereas that of animals are usually circular or round in shape. The shape and size of the cells can vary depending upon the function and structure of the organism.

this is poiselle's equation from fluid mechanic in physics. mech eng