Which scientific design has limitations due to oversimplification?

D. In a study of the effect of lawn fertilizer on the health of a backyard pond, biologists grow two colonies of duckweed in a large flask to represent pond ecosystems.

The scientific design in which has limitations due to oversimplification is the statement "in a study of the effect of lawn fertilizer on the health of a backyard pond, biologists grow two colonies of duckweed in a large flask to represent pond ecosystems". Oversimplification is an overview and generalization of a statement to miscomprehension, misperception or even error. It overlaps the true statement.