A circle has on fixed central point called the?

Look at the picture below . what does this picture represent ?

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

Which best describes the scientific method? a. a path of clearly defined steps that must be followed in a particular order b. a possible answer to a scientific question based on knowledge or research c. the recipe for how to conduct an experiment that must be followed precisely d. the process of hypothesis and testing through which scientific inquiry occurs