Why do cells have different shapes and structure?

Question

Do nucleus found in the same place within different types of cells? support your answer.

Skin cells seem fit together like pieces of jigsaw puzzle. How is such an arrangement helpful to an organism?

Do all cells have cell mebrane?

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Answer 1

1. No not always. Some cells don't even have a nucleus, e.g. erythrocytes (red blood cells).

2. So that it can act as a barrier to pathogens.

3. Yes, all cells need to excrete/absorb.