Mara and Laurence have been unable to conceive a child after trying for over a year. One option for solving this problem is for the doctor to inject some of Laurence's sperm directly into Mara's uterus. This procedure is called
A) infertility.
B) in vitro fertilization.
C) artificial insemination.
D) surrogate motherhood.
Question 2
Implantation of a zygote in the uterine lining takes place
A) immediately after fertilization.
B) about a day after fertilization.
C) within a week after fertilization.
D) in the second week after fertilization.
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