Question

summarize it! drag and drop the words or phrases that accurately complete the paragraph. in all scientific investigations, there are observations, data, and conclusions. however, not all scientific investigations are experiments. for an investigation to be an experiment, there must be a test variable (independent), outcome variables (dependent), and variables. investigations can also be comparative. these investigations observe groups in different conditions and compare the data. there test and outcome variables, but no controls. in descriptive investigations, the observer records information and makes conclusions based on the data. there of any kind, and comparisons are not made between objects or groups. might be confined controlled continuous are no variables are always

Explanation:

In scientific experiments, besides independent and dependent variables, controlled variables are kept constant. Comparative investigations may have test and outcome variables without controls. Descriptive investigations have no variables as they just record information without comparisons.

Answer:

controlled, might be, are no variables