Monozygotic twins are produced when:
two ova are fertilized by a single sperm.
one ovum is fertilized by one sperm, and then splits to form two clusters.
two ova are fertilized by two different sperm.
one ovum is fertilized by two sperm, and then splits to form two clusters.
one ovum is fertilized by one sperm, and then splits to form two clusters.
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Which of the following BEST reflects research on marriage in the social sciences?
A) ?It equally utilizes both heterosexual and same-sex married samples. B) ?It tends to overemphasize same-sex divorces but not same-sex marriages. C) ?It tends to include heterosexual married samples, but same-sex committed relationships. D) ?It is biased toward heterosexual relationships of all varieties.
Research that involves spending extensive time among the people being studied is called __________
a) case study research. b) ethnographic research. c) correlational research. d) ecological research.