4. (06.OS NC Two students are comparing scientific experiments to investigations. They came up with the following ideas. Student A: Testing plant growth in different types of soils student : Comparing the water level in a lake during different times of the year Which student gave an example of a scientific experiment? (5 points) student 8 because it requires a hypothesis Student B because it is preferably done across a long period of time O student A because it is preferably done in natural settings Student A because it requires experimental and control groups​