A recent series of TV commercials promoted the idea that a woman who wants to have a healthy baby must begin to eat well and avoid some medications and alcohol before she knows she is pregnant. Why?
What will be an ideal response?
Gastrulation and differentiation of embryonic cells occur before most women have missed their first period, when many don't even know they are pregnant yet. At these earliest stages, when important organ systems are being laid down, the embryo is very sensitive to drugs and nutrient levels.
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The LEAST hydrophilic substance is
A. salt. B. an ion. C. oil. D. an amphipathic molecule. E. a gas.
What is the function of the prostate secretions?
a. sperm maturation b. to provide sperm with energy c. to protect sperm from vaginal acidity d. to stimulate the release of LH e. to increase sperm motility
The first living cells were probably eukaryotic
1.True 2.False
Refer to the accompanying figure. Which region of the skin is composed mainly of collagen fibers?
a. 1 b. 6 c. 11 d. 14 e. 15