Final answer:
A community is formed by all the populations of organisms, such as plants and animals, that live and interact within a particular area. A population is all the individuals of the same species in an area. Ecosystems encompass the biological community and abiotic factors, while the biosphere is the collection of all ecosystems.
Step-by-step explanation:
All of the populations of organisms within a given area make up a community. A population consists of all the individuals of the same species that live and interact in the same area. When multiple populations, such as plants, animals, and microorganisms, live and interact in one area, they form a community, which is part of an ecosystem. An ecosystem includes not only the biological community but also the non-living elements, like water and sunlight. At the broadest scale, the biosphere encompasses all ecosystems and represents all zones of life on Earth.
For instance, within a forest ecosystem, the population of pine trees is made up of all the individual pine trees in that area. The forest community includes the populations of pine trees, flowering plants, insects, and microorganisms living together. Scientists study various aspects of a population, such as its density, dispersion, and birth and death rates, to understand its health and stability. It is through these studies that ecologists gain insight into the interactions of different populations and their environment, which contributes to our understanding of biodiversity and conservation.