Answer:
A control should have been included in the investigation
Explanation:
It is impossible for the student to interpret a correct conclusion about his experiment, without adding a control treatment where he can really compare the differences between the variables.
Control treatment is an element of research that receives all factors, except the variable being tested. The control serves to make comparisons with the other treatments, allowing to observe the exact difference between a system where the variable was tested and the system where it was not.
In the case of the question above, it would have been necessary for the student to have placed a cart on a ramp of normal height and without sandpaper. That way he could compare the speed between this cart and the carts on the other ramps, thus having a correct result.
Southern states threaten to nullify the tariff on imports enacted by Congress in 1828 because the tariff caused imports to cost more which hurt Southern states.
Answer: Option B
<u>Explanation:</u>
The tariff that the Congress enacted in the year 1828 on the imports from the English people in the United States caused the imports to cost more to improve the sale of the domestic products and reduce the imports from the European countries.
Since the manufacturers were mostly in the Northern part, the income from the tariff benefited those northern manufacturers only and it had an adverse affect on the Southern states.
Florence Nightingale (1820-1910), known as “The Lady With the Lamp,” was a British nurse, social reformer and statistician best known as the founder of modern nursing. Her experiences as a nurse during the Crimean War were foundational in her views about sanitation. Because of her great work she is called an international personality
<span>To aid expansion and administration of the kingdom
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When the author states "which is a frequent source of controversy in public debates," he is giving us some indication that the information that follows is a source of debate. The debate is that people cannot always agree on what the exact meaning of the amendment is.
