Which of the following biogeochemical cycles is most relevant to production of ammonia in soils?

DDT accumulation led to declines in birds due to:

A grassland ecosystem shows the following annual biomass (g/m²): Trophic Level Biomass Producers 10,000 Primary consumers 1,200 Secondary consumers 150 Tertiary consumers 15 Approximately what percentage of energy is transferred from producers to primary consumers?

 Keystone species are important because they:

Which of the following best explains how overfishing can lead to fishery collapse?

Small, isolated populations are most vulnerable to:

In a marine food web, removal of a keystone sea star results in the dominance of mussels, which are normally eaten by the sea stars and a variety of other marine organisms. This illustrates:

A dataset has the following 5 number summary:  (15, 42, 52, 56, 71).  The dataset is quite large (sample size 120).   Use the IQR method to check if any of the following values are outliers. Select the value(s) if any exist, that are outliers. Full credit can only be earned with appropriate work shown on scrap paper.  Submit your scrap paper to the dropbox within 15 minutes of finishing your test.

To estimate the proportion of Americans who support changing the drinking age from 21 to 18, a random sample of college students are asked “Would you support a measure to lower the drinking age from 21 to 18?” In the box below, type your answers to the following: Identify the intended population. Identify the sample. Is this biased?   If you answered yes to part 3, who might be overrepresented or underrepresented in the sample?

What analogy does the author use to describe the ‘parallel processing’ feature of stage-gate systems?