Final answer:
The main purpose of Sally and Sam's activity with potato shooters is likely for entertainment, as potato shooters are not typically used for agricultural, research, or cooking purposes. In Exercise 1.7.1, physiology, geophysics, and agriculture are recognized as branches of science.
Step-by-step explanation:
The question asks about the main purpose of Sally and Sam's activity of testing out their new potato shooters. Given the options provided, the most likely answer is a) Entertainment. Potato shooters are commonly used as toys for recreation, and not typically associated with agriculture, research, or cooking.
Now, to address Exercise 1.7.1 about which fields of study are branches of science, the correct options would be:
- a. physiology - the study of the function of an animal's or a plant's body
- b. geophysics
- c. agriculture
However, d. politics is not a branch of science but rather a social science dealing with systems of governance, and political activities, thoughts, and behavior.