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Name MANKIND AND NATURE IN HARMONY Look at Things Around You What’s in an Ecosystem? 4T4U2A03 Date Species, Population, and Communities OrganOr Organism Population Communities Species A species is a group of organisms that can mate and produce offspring like themselves. The offspring can also mate and produce organisms like themselves. For example, a male gray squirrel and a female gray squirrel can mate and produce offspring. The young gray squirrels look like their parents. Some organisms that look alike are not the same species. For example, a goose and a duck look alike. They both have feathers, webbed feet, and flat bills. But a goose and a duck can’t mate to produce offspring. They are members of different species. Populations All the organisms of the same species that live in the same place at the same time are a population. For example, all Canada geese are members of the same species, and the Canada geese that live at the same lake in the summer form a population. Mallard ducks that live at the lake form another population. Lake trout that live in the lake form a third population. Water lilies that grow in the lake form another population. Communities Populations that live in the same place at the same time make up a community. A lake community could have populations of geese, ducks, bass, water lilies, grasses, and many other species of plants and animals. The populations in a community interact with each other. Mallard ducks interact with the insects they eat. They also interact with raccoons that try to steal their eggs. Populations also compete with each other. Canada geese and mallard ducks both eat insects. They both build nests in hidden places around the edge of the lake.