A: TranscriptionB: Scientific method / Experimental proceduresC: TranscriptionD: Scientific method / Experimental procedures / Protein structure and enzymes

A: Protein structure and enzyme activityB: Data analysis and error bars (error of the mean, standard deviation…)C: Data analysisD: Photosynthesis (Calvin Cycle) / Data analysis

A: Natural selection - variationsB: Scientific method / experimental designC: Natural selectionD: Natural selection

A: Genetics (phenotypes and environmental)B: Gene expression and the environment (transcription and translation rates)C: ExperimentD: Gene expression and the environment