The answer would definitely be 3, morning.
In the field at Yorktown, Virhinia
Answer:
they lasted for more than 200 years
Answer:
C. The first animals that could live both in water and on land appeared during the <u>Paleozoic Era</u>
The reason why one case of influenza does not confer lifelong immunity is that the virus tends to mutate overtime which makes it unrecognizable to the immune system.
<h3>Why is it difficult to get immunity to influenza?</h3>
Influenza is caused by a virus which tends to mutate overtime in order to stay ahead of medical technology.
As a result, this mutation makes the original virus unrecognizable to the immune system which would then be unable to fight it.
Find out more on natural immunity at brainly.com/question/21480961
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