According to National U

question 104

Multiple Choice

According to national U.S.studies, in 1978 nearly __________ of children ages 5-10 had dangerously elevated levels of lead in their blood, which can cause brain damage; by 2001, the rate had fallen to __________.

• A)30%; 1%
• B)40%; 5%
• C)50%; 10%
• D)60%; 15%

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Definitions:

Rectangles

A four-sided flat shape where every angle is a right angle and opposite sides are parallel and equal in length.

Historical Episode

A significant event or series of events in the past that has a substantial impact on the present or future.

Circular Flow Diagram

A graphical representation depicting the flow of products, services, and financial resources in a cyclical pattern between consumers and businesses within the economy.

Systematic Thinking

An approach to problem-solving that involves breaking down complex issues into their components to understand the relationships and effects systematically.