Question

describing and/or quantifying parts of a system
which vocabulary term does this image represent?
observational investigation
comparative investigation
experimental investigation

Explanation:

The image shows activities like observing with a microscope, measuring with a scale, and looking at samples, which are typical of observational investigations where data is collected through direct observation and measurement without manipulation of variables as in experimental investigations, and without comparing multiple groups as in comparative investigations.

Answer:

observational investigation