At about how many weeks of pregnancy is an amniocentesis performed?
a. 5?7 weeks
b. 10?12 weeks
c. 14?16 weeks
d. 18?20 weeks
e. 21?24 weeks
C
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One reason angiosperms are more successful
than gymnosperms is because gymnosperms lack ___.
a. seeds b. megaspores c. fruits d. true leaves e. wood
El Niño and La Niña ____.
A. both decrease water temperatures in the eastern Pacific Ocean B. both increase water temperatures in the eastern Pacific Ocean C. both increase water temperatures in the Gulf of Mexico D. cause more rain and less rain, respectively, in Australia E. cause fewer hurricanes and more hurricanes, respectively, in the North Atlantic
In male humans, crossing-over between the X and Y chromosomes occurs at the
a. male-specific region. b. ampliconic regions. c. X-transposed regions. d. X-degenerate regions. e. pseudoautosomal regions.
All angiosperms have
A. animal pollinators. B. scented flowers. C. fleshy fruits for dispersal. D. nectaries. E. ovules enclosed in carpels.