Why both copies of the tumour-suppressor gene must mutate

Q1. Explain why both copies of the tumour-suppressor gene must mutate but only one copy of the proto-oncogene.

Q2. If a flake of biotitic within a sedimentary rock (suck as sandstone) is radio metrically dated, the date obtained indicates when?

Q3. Animals always want to get the most from their resources by increasing the surface area throughout their organ systems. Please cite five examples and how it does this.

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