Question

why are experimental investigations the best type of scientific investigation to demonstrate cause - and - effect relationships?

Explanation:

In experimental investigations, variables can be controlled. By manipulating the independent variable and observing the dependent variable while keeping other factors constant, it is possible to clearly identify cause - and - effect relationships. Other types of investigations like observational ones do not allow for such control over variables, making it harder to determine causality.

Answer:

Experimental investigations are best for demonstrating cause - and - effect relationships because they allow for control of variables, manipulation of the independent variable, and observation of the dependent variable in a controlled environment, which helps isolate the cause - and - effect connection.