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A researcher is in the cloud forests of Monteverde, Costa Rica. She is specifically interested in population biology, but cannot decide on what system she wants to study. Her colleague gives her a list of potential study systems.

As a population biologist, which of the following are possible study systems for the researcher? Select ALL that apply.


The hundreds of orchid species in the cloud forest canopy.


The different colonies of leaf cutter ants (Atta colombica) throughout the forest's ground cover.


The jaguar (Panthera onca) that has been seen around the field station.


The various species of microbes, invertebrates, and amphibians in puddles formed by fallen trees along with environmental measurements of the microclimate.


The groups of white-faced capuchin monkeys (Cebus capucinus) throughout the cloud forest.

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