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Biology SL (FE2025)

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Biology SL (FE2025)

Available time 20 Minute(s)

Some red blood cells and tissue cells are shown in the diagram below. Arrow 3 shows the movement of oxygen

What all causes an increase in natural selection?

The process of gene transfer by plasmids is illustrated below

Paper 1

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Some red blood cells and tissue cells are shown in the diagram below. Arrow 3 shows the movement of oxygen

What is shown by the arrow 1 and 2?

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