Final answer:
A population in a wooded ecosystem is the white pine trees, which, along with other plant, insect, and microbial populations, form a community. This community, combined with abiotic factors, constitutes the ecosystem of the forest.
Step-by-step explanation:
An example of a population that you may find in a wooded ecosystem is the population of white pine trees. All the white pine trees in the forest make up this population. In this ecosystem, the forest contains not only the pine tree population but also other populations such as flowering plants, insects, and microbial populations. When all of these different populations interact within the same forest, they form what is known as a community. The forest, being an ecosystem, is composed of both these living components and abiotic, non-living elements like nitrogen in the soil and rainwater. This illustrates the intricate web of life and how populations, along with nonliving factors, create the dynamic environment of a forest ecosystem.