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A researcher is studying the interaction between a bird species and a small mite species that lives on the bird’s feathers. The mites feed on the bird’s blood, causing the bird to lose feathers and expend more energy maintaining its health. The mites benefit from feeding on the bird, but the bird’s health declines as a result of the interaction. Based on this information, which of the following types of interactions best describes this relationship?

The level of ecological organization that focuses on a single living individual is the [organism] level, while the level that examines groups of the same species living in the same area is the [population] level.

Consider a population of insects starting at 100 individuals with a replacement rate of 1.05 per month. Then, consider that at three months, a predator is introduced, reducing the replacement rate to 0.90 per month. Calculate the population at A) 3 months and then at B) 6 months. (Need to show calculations to receive full credit).

Match each factor with whether it is density-dependent or density-independent:

Which of the following scenarios best illustrates optimal foraging in the presence of predation risk?

A species of plant, Species A, normally grows in nutrient-poor soils and is restricted to a narrow range of environments where it can survive. However, when Species A forms a relationship with a species of nitrogen-fixing bacteria, Species B, it can thrive in a much wider range of soil types, including nutrient-rich soils that were previously unsuitable. Which of the following best describes the relationship between the niches of Species A? 

Design an experiment to test whether species competition or environmental stress is the primary factor limiting tree growth in a high-altitude forest. In your answer provide a hypothesis, prediction, an experimental set-up, and what data would be collected.

A desert plant species blooms only after a significant rainfall event. When enough water is absorbed by its roots, a hormonal signal triggers the plant to flower and reproduce. Is the hormone-induced flowering a proximate or ultimate cause of behavior?

Match the abiotic factors with their influence on aquatic biomes:

Which of the following best contrasts interference competition and exploitation competition?