Which scientific design has the fewest limitations?
If these were the choices:
A. modeling an ocean ecosystem with a saltwater aquarium
B. observing the behavior of male caribou on the arctic tundra
C. using dissection to study the general structure of lily flowers
D. growing algae in different environments found on a spacecraft
Then, my answer would be C. USING DISSECTION TO STUDY THE GENERAL STRUCTURE OF LILY FLOWERS.
Other choices are very hard to do. Maintaining a salt-water aquarium is very hard while going to an arctic tundra or space is impractical.