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A primary source is a person (or a record produced by a person) who was actually there, as a witness or a participant of the event in question. A secondary source is someone who obtained information from a primary source and who then wrote or spoke about it.
A. Created a new code after theirs was cracked
Answer:
A subsequent theory, known as the “Kelp Highway,” came closer to the mark: As the massive ice sheets covering western North America retreated, the first humans arrived on the continent not only by foot but by boat, traveling down the Pacific shore and subsisting on abundant coastal resource
Explanation:
i hope this helps
Rocketry, or Radio not 100% sure tho
