Compare and contrast the climates of the North China Plain and Southern China.
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Awaiver of the requirement for documentation of informed consent may be granted when: the investigator has no convenient place to store signed consent forms separate from the research datathe only record linking the subject and the research is the consent document and the principal risk is a breach of confidentiality.potential subjects might find some of the research questions embarrassing, personal, or intrusivethe subjects are literate in their own language; however, they do not read, write, or speak english

Refers to the biological heritage people use to identify themselves.

What caused the settlement of more african americans in the mississippi alluvial plain region than in the ozark mountains point)