Concept:Autecology is the branch of ecology that focuses on one individual organism or a single species and its relationship with the environment.
Explanation:Ecology is studied at different levels.
Autecology deals with only one organism or one species at a time.
It examines how that organism or species responds to both living and non-living components of its surroundings.
For example, studying how a particular fish species copes with temperature changes in a pond is an autecological study.
Synecology instead studies whole communities of different organisms living together and interacting with the environment.
Because the question mentions “an individual organism or a single species”, the definition matches autecology.
The other options, such as synecology and ecological concepts, refer to broader or different ideas.
Answer:A. Autecology