In the Pacific Ocean off the coast of Peru, winds are pushing warm surface water away from the shore and allowing cold, nutrient-rich water to reach the surface, resulting in a surge of productivity and a very rich season for sardine fishermen. This region of the ocean is experiencing

Warm, subtropical, high-pressure air periodically moves over Mexico City and traps air in the Valley of Mexico. The air also traps pollutants, producing high smog levels. In this situation, Mexico City’s poor air quality is made worse by which climatic factor?

These abiotic factors determine the biome found in a particular geographic location.  Select ALL correct answers.

Refer to the figure.        This Walter climate diagram suggests which type of biome characterized by which type of plants?

The most common usage for the pilus in bacteria is to:

The insects were the first organisms to

Refer to the graph showing changes in atmospheric CO2 concentrations in the Northern Hemisphere beginning in 1960.        What is the overall trend in CO2 concentration, and what causes the yearly seasonal fluctuations?

Which group of animals is endothermic?

Before Hurricane Katrina devastated New Orleans in 2005, humans had vastly changed the area. They had destroyed wetlands, extracted oil and gas (which led to sinking of the ground), constructed dams and levees, dredged, and built channels for ship traffic. Also, rising sea levels had caused the death of some cypress swamps. These changes suggest that development of New Orleans destroyed which major ecosystem service that might have lessened the hurricane’s devastation?

An example of a trait controlled by multiple alleles is