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Many species of ants “farm” aphids, protecting them from predation and collecting concentrated sugars (i.e. honeydew) from them. This type of ant/aphid relationship is known as

Consider a compartmental model for an influenza (flu) virus, with susceptible, infected, and immune categories. Match each of the following with one of the three categories: A person carrying the flu virus and showing symptoms [choice1],  A person who has never been vaccinated for the flu virus [choice2] A person who was vaccinated against the flu 5 years ago (vaccine effective for 1 year) [choice3]  

What concepts enable two or more species with similar niches to coexist in a community? Select all that apply.

The serotinous cones of the longleaf pine, Pinus palustris, depend on _____ to release their seeds.

What is an example of a +/− interaction?

A scientist is studying several areas along an elevation gradient. Her study involves prescribed burns (purposefully set, low-intensity fires) in the different areas, followed by a comparison of the type and abundance of organisms that colonize them over the next ten years. What scale best describes her study?

The per capita growth rate of a population is best defined as

Which of the following are likely to exhibit exponential population growth? A small number of individuals introduced into a new habitat with plentiful resources but lacking predators and competitors. A population close to its carrying capacity. A population where the net reproductive rate (R0) is 0.25. 

Many species of birds form large flocks. What dispersion pattern describes this behavior?

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