List and describe the four different types of random sampling discussed in the text.
What will be an ideal response?
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Although we arbitrarily divide pregnancy into three trimesters, there are other periods that are more significant for the developing baby. These periods are called the ____________ period, the _____________ period, and the _______________ period
A. germinal; embryonic; gestational B. embryonic; fertilization; ectopic C. fertilization; ectopic; germinal D. germinal; embryonic; fetal
In the case of structural chromosomal abnormalities all of the following structural changes can occur except:
A. genetic material is deleted. B. genetic material is duplicated. C. genetic material is inverted. D. a whole chromosome is added or deleted.
A critical level of body fat in adolescence is necessary for girls because
A. their long bones will not complete their development without it. B. it enables girls to maintain regular menstrual cycles. C. the pubertal growth spurt will not begin without it. D. it keeps their periods from being unusually heavy.
Which hypothesis posits that asthma and allergies have increased because our environment has become cleaner, thus lowering our exposure to germs and, as a result, our immune system is less able to differentiate between harmful substances and less harmful irritants?
A. Immunosuppressant hypothesis B. Reactionary hypothesis C. Hygiene hypothesis D. Irritant hypothesis