II. Complete the following sentences choosing suitable words from the box.
childbirth, merge with, fertilization, oocyte, implantation, ultrasound, trimester, placenta, triplets, pregnancy, embryos, gestations
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Pregnancy is the carrying of one or more ________ or foetuses by female mammals, including humans, inside their bodies.
In a pregnancy, there can be multiple ________ (for example, in the case of twins, or ___________).
Human pregnancy lasts approximately 9 months between the time of the last menstrual cycle and ___________ (38 weeks from fertilization).
Human pregnancy is somewhat arbitrarily divided into three _________ periods.
Before pregnancy begins, the female _________ (egg) must _________ the male spermatozoon in a process referred to as “fertilization”.
An accurate date of _________ is important, because it is used in calculating the results of various prenatal tests.
The beginning of pregnancy may be detected in a number of ways, including various tests which detect hormones generated by the newly-formed _________ .
Clinical blood and urine tests can detect pregnancy soon after ________, which is as early as 6-8 days after fertilization.
Both clinical and home tests can only detect the state of _________, and cannot detect its age.
An early __________ can determine the age of the pregnancy fairly accurately.
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