The Environmental and Climatic Changes Wrought by the Diversion of Water

question 179

Multiple Choice

The environmental and climatic changes wrought by the diversion of water from the Syr Darya and Amu Darya rivers are reflected in which of the following phenomena?

• A) saltwater intrusion in the Black Sea
• B) shrinkage of the Aral Sea
• C) heavier and more frequent rains in Central Asia
• D) cooler average temperatures throughout Central Asia

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Definitions:

Natural Killer Cells

A type of lymphocyte (white blood cell) that plays a major role in the rejection of tumors and cells infected by viruses.

Interferons

A group of signaling proteins made and released by host cells in response to the presence of pathogens, such as viruses, bacteria, or tumor cells.

Antigen-Presenting Cells

Cells that process and present antigens to T-cells to initiate an immune response.

Major Histocompatibility Complex

Major Histocompatibility Complex is a set of genes that code for proteins on the cell surface, which help the immune system recognize foreign substances.