How does an intrauterine device (IUD) prevent pregnancy?
A. killing sperm as they enter the fallopian tubes.
B. preventing sperm from entering the vagina.
C. creating a uterine environment toxic to sperm and eggs.
D. disabling the cilia that facilitate the passage of the eggs.
Ans: C. creating a uterine environment toxic to sperm and eggs.
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Indicate whether the statement is true or false.
Which variable has the stronger influence on the color of an individual's skin?
A. the individual's phenotype B. the individual's genotype C. the amount of time spent in the sun and the individual's genotype D. the amount of time spent in the sun E. Neither the sun nor the individual's genotype have any influence on the individual's skin color.
Into which area does the descending segment of the loop of Henle extend?
a. into the renal pelvis b. into the renal medulla c. into the Bowman's capsule d. into the collecting ducts
Tropical rain forests are near the equator; they stay warm all year and have high annual precipitation. Northern coniferous forests have four seasons and most of the precipitation falls during winter and spring
Which of these ecosystems would you expect to be more productive? Explain why.