Final answer:
A community is formed by all the populations of different species living and interacting in the same ecosystem. It contributes to the ecosystem's species diversity and is influenced by various types of interactions. Biologists study these interactions to understand ecosystem dynamics and biodiversity.
Step-by-step explanation:
All the populations of all the different species living together in the same place, in the same ecosystem, interacting with one another form what is known as a community. This includes various biotic elements ranging from plants and animals to fungi and microorganisms. Within a community, each population, which consists of organisms from the same species living and interacting in an area, contributes to the species diversity of that habitat. The interactions among these different populations, such as competition, predation, and symbiosis, play a critical role in regulating population growth and overall ecosystem health.
An ecosystem encompasses not only these living components but also the abiotic, or non-living, factors such as water, air, and soil. The highest level of organization is the biosphere, which includes all ecosystems. Biologists and ecologists study these interactions at the community level to gain insights into the complex dynamics of natural habitats and the biodiversity within them.