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Nitrogen fixation is the conversion of [gaseousN] to [organicN]. 

At which location on the map would a person float most easily? Assume that lighter areas of water indicate less salinity.

________________ is the name of the group of invertebrates that feed on coarse particulate organic matter, such as leaves that fall into streams and rivers.

The thunderstorms seen across the center of this satellite image are a part of the storms that provide __________ rain for __________.

Soils smell like rotten eggs when sulfur is oxidized.  

A patient presents with diffuse abdominal pain, fever, and changes in mental status. Which condition is the most likely cause of these symptoms? 

A rare, catecholamine-secreting tumor arising from the chromaffin cells of the adrenal medulla.

A 38-year-old woman is diagnosed with an H. pylori-positive peptic ulcer. Which of the following is an appropriate first-line eradication regimen?

The hyphae of AMF (arbuscular mycorrhizal fungi) form bushy or balloon-like haustoria after making contact with the plasma membrane of a root cell. What is the function of these structures?

Which of the following noninvasive biomarkers is most useful to distinguish IBD from functional bowel disorders like IBS?