Question

identifying descriptive investigations
use the drop - down menu to complete the sentence.
descriptive investigations involve collecting data about a system, but not making
dropdown options: observations, measurements, comparisons, x conclusions

Explanation:

Descriptive investigations collect data on a system without making comparisons (as comparisons imply analyzing differences, which descriptive work doesn't do; it focuses on describing, like observations or measurements, but the blank here is about what they don't do—making comparisons).

Answer:

comparisons