People who had this mutation back in the 14th century had better chance of survival (better fitness) then people who did not have this mutation. They were majority of people who survived the Black Death because of natural selection. Their offspring inherited this mutation too, and their offspring after.
There was no natural selection for this mutation in some other parts of the world because they were not hit by the Black Death.
Since the same mutation is responsible for immunity to HIV and the Black Death, offspring of the people who have survived the Black Death are immune to HIV too. Part of the world that was hit by the Black Death, now have more people with this mutation.
Answer:
Both occur in the Pacific Ocean.
Explanation:
El Niño and La Niña are opposite phases of a natural climate pattern across the tropical Pacific Ocean that swings back and forth every 3-7 years on average
Psychical, because you all you are changing is the state. You can simply reverse it by putting it in the fridge again.
ATP is needed for active transport.
Active transport mechanisms require the use of the cell's energy, usually in the form of adenosine triphosphate (ATP).
Larynx.
<span>The larynx is also known as the body’s “voice box” as it contains the vocal folds that produce the sounds of speech and singing.</span>
