What typically causes a miscarriage?
A) Genetic or physical defects in the embryo.
B) Alcohol use by the mother early in pregnancy.
C) Excessive physical activity by the mother early in pregnancy.
D) A mismatch of the immune systems of the father and mother.
E) Researchers do not yet have an answer to this question.
Correct Answer:
Verified
Q34: About what percentage of births are twins?
A)
Q35: How do identical twins occur?
A) One sperm
Q36: What is the difference between fraternal twins
Q37: Under what circumstances might identical twins be
Q38: According to your text, about what percentage
Q40: Most conjoined twins survive. True or False?
A)
Q41: Do scientists know what causes conjoining in
Q42: Why do some people call conjoined twins
Q43: Is it true that only your genes
Q44: What is Anton van Leeuwenhoek known for?
A)
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