Study of environmental relations is called:

Explanation

Option A: Physiology is the study of the functions of living organisms. It includes the study of how organisms' bodies work, how they respond to their environment, and how they reproduce. Option B: Pulmonology is the study of the lungs and the respiratory system. It includes the study of how the lungs work, how they exchange gases with the blood, and how they are affected by disease. Option C: Morphology is the study of the form and structure of living organisms. It includes the study of how organisms' bodies are shaped, how their organs are arranged, and how their tissues are organized. Option D: The study of environmental relations is called ecology. Ecology is a branch of biology that studies the interactions between living organisms and their environment. It includes the study of how organisms interact with each other, with the physical environment, and with the other living things in their environment.