The difference between small, controlled lab experiments versus an ecosystem-scale experiment is the number of variables.
What is an experiment?
A technique used in science to create a discovery, test a hypothesis or prove a known fact.
Lab experiments are done in the lab with a limited amount of variables as there is limited space available.
The ecosystem-scale experiment is performed on large scale and with many variables.
Thus, the difference is the number of variables.
Learn more about experiments, here:
https://brainly.com/question/9199868
