Marcello is taking an introductory psychology course this semester and was surprised to learn that the experimental method is the best way to uncover cause-and-effect relationships because:

Marcello was surprised to learn that the experimental method is the best way to uncover cause-and-effect relationships because an experiment is a procedure carried out to support, refute or validate a hypothesis or theory. Experiments provide insight into cause-and-effect by demonstrating what outcome occurs when a particular factor is manipulated. Experiments vary greatly in goal and scale, but always rely on repeatable procedure and logical analysis of the results.

Explanation:

Generally, in experimental method, one or more variables are manipulated to determine their effect on a dependent variable. The experimental method is a systematic and scientific approach in research in which the researcher manipulates one or more variables and controls and measures any change in other variables.

Moreover, experimental designs often make use of controls that provide a measure of variability within a system and a check for sources of errors.

- "these rights are natural and god-given to all men equally." (i disagree cuz i kind of think it's 'a' but who knows.)

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.