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What is an ecosystem?

  1. A series of interactions between a species and its environment

  2. The interactions between different species

  3. A single organism's interactions with its environment

  4. The interactions between a population and its environment

The correct answer is: The interactions between a population and its environment

An ecosystem is a system or community that consists of all living and nonliving things in a particular area and their interactions. While choices A, B, and C all involve interactions, they are not an accurate representation of what an ecosystem is. Choice A focuses only on one species, while choice B focuses on multiple species without mentioning other components of an ecosystem such as abiotic factors. Choice C also only describes the interactions of a single organism, rather than all living things in an area. Choice D, however, acknowledges the importance of the interactions between a population of species and the environment they live in, making it the correct answer.