China's population control policies have
resulted in a(n)
a. sharp decrease in its total fertility rate.
b. shift in its gender ratio.
c. increase in the abortion of female fetuses.
d. ratio of 1.19 males for every female.
e. all of these
E
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Clinal variation usually results from ____ between ____ populations that are each adapting to slightly different conditions
a. isolation; adjacent b. isolation; distant c. genetic drift; distant d. gene flow; adjacent e. genetic drift; adjacent
The components of a nucleotide are
A) a carboxyl group, an amine group, and a variable R group. B) a five-carbon sugar, a phosphate group, and a nitrogen-containing aromatic base. C) a three-carbon alcohol with a hydroxyl group on each carbon and three fatty acids. D) two six-carbon sugars attached with an ?(1?4) glycosidic bond. E) a six-carbon sugar, an ester linkage, and a four-ringed hydrocarbon.
Legionellosis is a zoonosis.
a. true b. false
List, in order of appearance, all the cell types expected to be formed during oogenesis
A) oogonium, primary oocyte, secondary oocyte and first polar body, ootid and second polar body B) oogonium, primary oocyte, second polar body and ootid, secondary oocyte and first polar body C) primary oocyte, secondary oocyte and first polar body, oogonium, second polar body and ootid D) primary oocyte, secondary oocyte and first polar body, ootid, second polar body, oogonium E) primary oocyte, secondary oocyte and first polar body, second polar body, ootid, oogonium