Here's why:

* Ecology is a branch of biology that focuses on how organisms interact with each other and their surroundings.

* This includes interactions between different species, as well as the impact of physical factors like temperature, sunlight, and water availability.

Other phrases that might be used to describe ecology, but are less specific, include:

* The study of living things in their natural environment

* The science of relationships between organisms and their environment

* The study of ecosystems

Let me know if you'd like more details on any specific aspect of ecology!