In the Developing World, Mortality Rates Have Started to Decline

question 67

Multiple Choice

In the developing world, mortality rates have started to decline because of:

• A)fewer numbers of women of childbearing age
• B)imbalanced sex ratios
• C)HIV and AIDs cures
• D)fewer babies being born
• E) improved sanitation, vaccinations, and medicines

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Definitions:

Pure Substances

Materials that are composed of only one type of atom or molecule, exhibiting consistent physical and chemical properties throughout the sample.

Uniform Composition

A characteristic of substances where the composition is consistent throughout the material, indicating a homogeneous mixture or pure substance.

Molecule

The smallest unit of a chemical compound that can exist, consisting of two or more atoms bonded together.

Atom

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element, consisting of a nucleus surrounded by electrons.