Question

Why is the shape and size of cells different

Answer 1

basically cells are different sizes because of how their cytoskeletons are arranged (action, micro tubules, micro filaments) 
that act as a framework for the organelles of the cell to rest on 
cells are different shapes for their specific functions, red blood cells are shaped like a doughnut to carry more haemoglobin, and to fit through small spaces, your epithelia of your gut have many small finger-like extensions to increase surface area to absorb the nutrients from digestion, and your neurons are long and skinny to span wide places to send signals around your body.......

Answer 2

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Animal cells in particular come in all kinds of shapes and sizes. Plant cell shapes tend to be quite similar to each other because of their rigid cell wall. Cells are ofdifferent shape,size and structure according to the function they needs to perform. ... Cells have different shapes because they do different things.

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