Question

what is a comparative investigation?
none of these
a type of scientific investigation that focuses on collecting data for comparison
a type of scientific investigation that focuses on observing and recording findings
a type of scientific investigation that tests how one thing specifically affects another

Explanation:

A comparative investigation in science aims to collect data for comparison among different groups, samples or conditions. It doesn't just focus on observation - recording (which is more of a descriptive investigation) or testing cause - effect (which is an experimental investigation).

Answer:

A type of scientific investigation that focuses on collecting data for comparison