Scientists use specific levels of organization to analyze the biosphere. which level of organization describes a school of anchovies or a gaggle of geese?

A school of anchovies or a gaggle of geese or even a pod of orca whales would be a population. A population refers to all members of the same species.

  The biosphere consists of all organism living on earth, the term was first coined by Edward Suess in 1875 but it was not untill the 1920s when it was redefined by Vladimir Vernadsky to denote its current meaning, it has a structure of five levels of organization:

Earth´s biomes: they are the largest of the organization levels, the experts also divide this type into five; aquatic, desert, forest, grassland and tundra. This type highlits the importance of the physical geography on the communities of living organism.Ecosystem: they contain biotic and abiotic factors sucha as animals, plants, oxygen and carbon; they are divided based on the interaction and the transfer of energy. This means that inside every ecosystem energy is consumed and matter is cycled.Communities of species: a congregation of multiple species make out a community, they share a particular habitat or environment, the limits to establish a community are the capacity each specie have to survive given the abiotic´s factors of the region.Population count: this type includes all the members of a single specie in a particular habitat. It can contain thousands of memebers or only a few hundred. This indicator is an important information that the investigators use to determine the health of the ecosystem analyzed.Organism: They are living creatures that use DNA to replicate; they are classified in two ways according to their cellular structure or the way they obtain energy.

  As I have marked in Bold I believe the correct answer is that the level of organization that best describes a school of anchovies or a gaggle of geese is the number 4 population count. I hope the answer help you. Regards