Reading Passage 1: "William Kamkwamba"

and think domesticated horses play a less essential role than wild horses. It is 
true that this paragraph compares these two different types, 
but does not claim one is 
more essential than the other.
iii 
Playing a less essential role
Comment: 
The 
main idea of the paragraph is expressed at the beginning 
and it is 
about the 
different traits (qualities) that domesticated horses have
. And these traits 
are developed because that is what humans desire in their domesticated horses:
Q 3. Section C: 
ii Developing desirable characteristics
Comment: 
There is another question we can answer using the information in this 
paragraph:
Q 10. 
Methods of artificial selection have changed over the centuries.
Meaning:
Have people changed their methods of artificial selection over the centuries?
Answer: 
We don’t know. Therefore, 
Not Given
Explanation: 
This paragraph applies the law of ‘natural selection’ to ‘artificial selection’ 
where humans, not the nature, select the desirable traits. However, it does not mention 
any methods being changed over time.
Question 4
Part of the passage [Par D]:
 
For more than 3,000 years, a fighter on horseback or 
horse-drawn chariot was the ultimate weapon. 
Time after time, from Asia to Europe 
to the Americas, the use of horses has changed the balance of power between
civilizations. 
When people with horses clashed with those without, horses provided 
a huge advantage. When both sides had horses, battles turned on the strength and
strategy of their mounted horsemen, or cavalry. Horses continued to define military
tactics well into the 1900s, until they finally became outmoded by machine guns, tanks, 
airplanes and other modern weapons.