What Refugee Group Is Aided by the UN Relief and Works

question 31

Multiple Choice

What refugee group is aided by the UN Relief and Works Agency?

• A) Palestinians.
• B) Chechens.
• C) Afghans.
• D) Bosnians.

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Definitions:

Chemicals

Substances with a distinct molecular composition that are used or produced in processes involving chemical reactions.

pH

A measure of the acidity or alkalinity of a solution, defined by the negative logarithm of the hydrogen ion concentration.

Buffer System

A chemical system that maintains the pH of a solution by adjusting the proportion of acid and base.

Hemoglobin Buffer

A system in red blood cells that helps maintain pH balance in the blood by binding to or releasing hydrogen ions.