Answer:
These were the people the European explorers met when their ships landed in America. Europeans were used to these diseases, but Indian people had no resistance to them. Sometimes the illnesses spread through direct contact with colonists. Other times, they were transmitted as Indians traded with one another.
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I'd guess b on this one. I don't know the definition of watershed, but the amazon is a pretty big expanse of water "stretching" a long way (albeit that water doesn't stretch).
Answer:
1.6 million km2 (615,000 sq mi), I Guess.
Answer: It decomposed into nutrients in the soil
