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 B: Comparing the water level in a lake during different times of the year

Which student gave an example of a scientific experiment?

Select one:
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 natural settings
d. Student B because it is preferably done across a long period of time