Answer:
a volcanic eruption must have occurred nearby which scared the sea creatures away
Explanation:
most sea creatures are scared by volcanic eruption
I think the answer is b not too sure though
Answer:
Immunity to Small Pox
Explanation:
Over the years, Europeans had built up an immunity to smallpox because many had contracted the disease and still survived. As the population grew children were born with some immunity to the disease. When the Europeans arrived in the Americas, and smallpox spread around the native peoples, the Europeans did not contract the disease because they were immune. However, since the natives were not immune, they slowly died of due just to the disease as well as some parts of the war between the europeans.
The answer would be c, obtain the same results after the experiment is done