Answer:
How is plant growth affected by differing amounts of sunlight?
How does the mineral content of rocks in the ocean compare to the mineral content of rocks found on land?
Step-by-step explanation:
The scientific method can only be used to answer objective questions that are based on measurable/observable data from repeatable laboratory or field experiments.
The questions of 'Why does increasing the amount of vinegar added to baking soda increase the amount of bubbles that form?' and 'Why does salt change the boiling point of water?' cannot be answered using the scientific method because they are subjective questions that cannot be answered using measurable data.
How plant growth is affected by differing amounts of sunlight and how the mineral contents of rocks in the ocean compare to that found on land can both be answered through data collection and repeatable experiments.