When researchers cannot randomly assign participants and manipulate conditions in the real world, they can sometimes compromise by conducting experiments

The answer is natural experiments.

Explanation:

In natural experiments, the groups of participants are not controlled by the researchers. They are often done when lab experiments would interfere with the validity of the study, or when applying it would be unethical (for example, experiments related to diseases are often studied in a natural environment).

Natural experiments are recorded through observation. They usually seek to understand the effects of an environmental factor in a sample population.

answer; i believe that the correct answer to the above question is; (tariff)

the language of nature was a manifestation from god as he said "let there be light" and there was light the world began to assume visible, comprehensible form.

what ever we know now think of the old vision of creation we can be sure that with out the speaking of word -without language- we would have no science today with its striking power to illuminate the world.