Two students are comparing scientific experiments to investigations. They came up with the following ideas. Sudent A: Testing plant growth in different types of soils Student B: Comparing the water level in a lake during different times of the year Which student gave an example of a scientific experiment? a) student a because it requires experimental and control groups b) student b because it requires a hypothesis c) student a because it is preferably done in naturaal settings d) student b because it is preferably done across a long period of time