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No person has ever 'explored' any planet, besides Earth. Several people have been to the moon. Unmanned vehicles have been to Mars. Mankind has only 'explored' other planets visually.
no
Yes, I think so now. Most of world has been explored already and most explorers do not make any earth-changing discoveries.
While there aren't really any parts of the world that have yet to be discovered, there are lots of parts of the world that are yet to be fully explored. The bottom of the ocean and many rain forests for example, have yet to be fully explored.
the moon drier than any desert on Earth, but the water is said to
yes, there probably is, and one day it will be explored.
yes
yes
probably. there are so many to count now, and we haven't even explored that much of the world yet.
An alligator is not essential to the biology of ANY swamp. There are plenty of swamps in the world where alligators have never been part of the ecology.
yes
Refugees can come from any part of the world, so there have been some refugees from European countries at different times.