Question

which of the following does not represent a population?
all the grass frogs in the pond of central park in new york city
all the elk in yosemite national park
all the birds in chicago, illinois
all the robins in austin, texas

Explanation:

A population is a group of individuals of the same species in a defined area. All options except "all the birds in Chicago, Illinois" represent a single - species group in a defined area. Birds in Chicago are a diverse group of multiple species, not a single - species population.

Answer:

all the birds in Chicago, Illinois