2. 'They're moist, wiggly creatures, and many people don't like to touch them. 2Nevertheless, earthworms are very useful. People who like to fish, of course,
know that worms make great bait. 'They also help improve the condition of
the soil. "As they dig under the ground, earthworms constantly take soil into
their bodies. Their bodies use part of the soil and pass out the rest in the
form of fine powder. That powder, called cast, makes the earth richer. *In
addition, the tunnels that worms create make the earth better able to absorb
water and air.
3. 'A dermatologist brought together sixty-five young people who were prone
to acne. Every day for four weeks, he fed each of them either a super-
chocolate bar, containing ten times the chocolate of an ordinary candy bar,
or a look-alike candy bar that tasted like chocolate but contained none.
None of the subjects knew whether or not they were eating real chocolate.
"Halfway through the experiment, the dermatologist switched bars on the
subjects. The subjects' acne was not affected by including chocolate in their
diets. The dermatologist's experiment suggests that chocolate is not to
blame for complexion problems.

native americans suffered high rates of poverty and unemployment.

during the late 1960s and early 1970sthe need for political militancy grew among the native americans. throughout the 1960s, they had been the nation's poorest minority group, the most deprived group, according to practically every socioeconomic measure. in 1970, the indian unemployment rate was 10 times the national average, and 40 percent of the native american people were below the poverty line.

what are you options

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.

the correct answer is:   "   3.6 % " .

          →   the unemployment rate is:   " 3.6 % " .

explanation:

to calculate the "unemployment rate" :

the "unemployment rate"   =

  [# of people unemployed] /   [working age population]   * 100 %   ;

                =   [9 million] / [250 million]     *   100 % ;

    →     note:   the units of "million" cancel out;

                    since:   " {million} / {million} = 1 " ;

                =   (9 / 250)   * 100 %   ;

                = 0.036 * 100 % ;

                =   3.6 %

answer:   the unemployment rate is:   " 3.6 % " .