Fertilizer 7. Students measured the temperature of the water at different depths in Lake Skywalker and found that
the temperature varied,
1:
D:
C:
8. The amount of pollution produced by cars was measured for cars using gasoline containing different
amounts of lead.
D:
C:
9. Four groups of rats are first massed and then fed identical diets except for the amount of vitamin A they
receive. Each group gets a different amount. After 3 weeks on the diet, the rats' masses are measured again
to see if there has been a decrease.
1:
D
C: