The study of the relationships of organisms with other organisms and the surrounding environment.
The study of the interaction of organisms with each other and with their environment.
The study of the mutual relationship between people and their environment.
The study of the interrelationships between organisms and their environment.
The interaction of people with their environment.
The study of the relationships between man, plants and animals, and the environment, including the way in which human activities may affect other animal populations and alter natural surroundings.
The science of the relationship of organisms to their environment, including the interactions among organisms.
The examination of how living organisms interact with their surrounding environment.