The difficulty in using skin color to categorize human groups is that:
A. the precise genetic mechanisms of skin color are not known
B. skin color can be strongly influenced by environmental and cultural factors
C. skin color distribution is largely clinal
D. all of these
D. all of these
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Prehensile (grasping) tails are characteristic traits of
A. lemurs. B. Old World monkeys. C. tarsiers. D. New World monkeys. E. pongids.
Which of the following statements is incorrect about the ABO blood type system?
A. There are three major alleles for the system. B. There appears to be selective significance between the ABO system and certain types of diseases. C. Blood type O is the most frequent blood type in all human populations. D. One or more of the four ABO blood types could be absent from a specific population.
There were three separate centers of domestication in China—one in the north, one in the south, and one on the eastern coast
Indicate whether the statement is true or false.
Migrant workers often send remittances to their families back in their home village
a. True b. False Indicate whether the statement is true or false