What statement is true regarding water chlorination?
a. It has no effect on many harmful microorganisms found in water.
b. It has been documented to cause cancer in people who drink it regularly.
c. Alternative treatment systems for water are much less expensive and faster to use than chlorination.
d. Deaths from organisms in non-chlorinated water are common in some parts of the world.
e. It does not easily kill disease-causing organisms in water.
Question 2
A friend informs you that she is planning to purchase a water softener. Which statement is most appropriate for you to make to your friend?
a. Hard water makes more bubbles with less soap than soft water and is more desirable.
b. Soft water leaves a ring in the tub and a gray residue in the wash, which are undesirable.
c. Soft water appears to aggravate hypertension, which is undesirable.
d. Soft water has higher concentrations of calcium and magnesium than hard water, which is desirable.
e. There is no difference in mineral content of soft and hard waters.
Effect of Zero Gravity on Cosmonaut's Body.
water movement
Mars with water
Inverse Relation Between IQ and Disease. Could this explain the Flynn effect?
The Flynn Effect
Is the principle of cause and effect unfounded?