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The Arctic was known and explored before humans ventured to the southern polar regions. Antarctica's name is simply anti-arctic.
Not likely.
Not likely.
The complete subject in the sentence is "Prehistoric humans." It includes both the noun "humans" and the describing word "Prehistoric," which together identify who or what the sentence is about.
The prehistoric era was before humans.
Humans
The Arctic
Scholars learn about prehistoric humans through various methods such as archaeological excavations, analysis of ancient artifacts, examination of human fossils, and studying ancient DNA. By piecing together evidence from different sources, scholars can reconstruct the lifestyles, cultures, migrations, and interactions of prehistoric humans.
Giant sloths and early humans lived in prehistoric Georgia.
No. The planet we are most likely to colonize is Mars.
Probably.
Yes because humans have learned technology.