Answer:
Population level
Step-by-step explanation:
The total of living organisms on Earth is organized at different levels. The broadest level is the biosphere that encompasses all the ecosystems on Earth.
Groups of organisms such as anchovies and a gaggle of geese belong to the level of organisms, populations and communities. (In certain examples, these three levels are clumped together).
Thus, a goose is an individual and together with other geese form a gaggle. A gaggle and/or several form the population of geese in a region. The geese together with other local organisms such as swans and plants form a community.