Amoeba are single-celled organisms that live in water. They are able to change their shape. The diagram shows two different shapes that one amoeba can make. Shape 1 Gas exchange in an amoeba takes place across its cell membrane. The amoeba can be roughly spherical, as shown in Shape 1. Which is the surface area of the amoeba in this shape? Use the formula: $$\[ \text { surface area of a sphere }=4 \pi r^{2} \]$$ (1)

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