Why do polar substances such as NaCl dissolve so readily in water?
A) NaCl is a very dry powder, and the water is able to soak into the salt.
B) The sodium ions repel the negative end of the water molecule.
C) Spheres of hydration form between the water and the ions.
D) The charged ends of the water molecules are able to surround the oppositely charged salt ion.
E) both choices C and D
E) both choices C and D
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a. gonads b. polar hormones c. peptide hormones d. cells in the blood e. neurons
When new species of a lineage move into a wide range of habitats during bursts of microevolution, it
is referred to as a. uniformitarianism. b. gradualism. c. convergence. d. adaptive radiation. e. special creation.
Wernicke's area of the temporal lobe is involved in the:a
body's biological clock. b. coordination of motor activity. c. recognition and interpretation of words. d. processing of chemical stimuli. e. processing of visual stimuli.
A zygote is
a)a haploid cell. b)a gamete. c)a direct product of meiosis. d)All answers are correct.