Final answer:
The unnecessary information to show in a process flow diagram for creating a strawberry banana smoothie is the blender brand and model. The diagram should include ingredients, step-by-step instructions, and nutritional information.
Step-by-step explanation:
In a process flow diagram for creating a strawberry banana smoothie, the unnecessary information to show would be the blender brand and model. The diagram should include the ingredients needed, such as strawberries, banana, yogurt, and ice cubes, as well as the step-by-step instructions for creating the smoothie. The nutritional information may also be included to provide details about the smoothie's calorie content, vitamins, and other nutrients.