Concept:Government as an academic discipline examines the organisation, institutions, and activities of political systems, not natural environmental processes.
Explanation:Political economy is included because it explores how political power and economic policies interact within the state.
Comparative politics is included because it studies and contrasts different governments, regimes, and political behaviours across countries.
Public administration is included because it deals with the implementation of government policies and the functioning of the civil service.
Ecological interaction, however, belongs to environmental science or biology, as it studies relationships between organisms and their surroundings.
It does not form part of the customary scope of government as an academic field of study.
Answer:D. Ecological interaction.