A human cell with a total of 23 chromosomes is:
a. diploid.
b. aneuploid.
c. polyploid.
d. haploid.
Ans: d. haploid.
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The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of
A. increasing evolutionary resistance. B. creation of new species. C. genetic drift. D. outcrossing. E. natural selection.
Hormone levels and action are determined by
a. other hormones or releasing agents. b. carbohydrate activity. c. positive feedback systems. d. prostaglandins. e. touch receptors.
Spongy bone is ____
a. very weak b. the major component of the Haversian system c. made primarily of cartilage d. found inside a long bone’s shaft e. dense
Vast ____________________ form in the interior of midlatitude continents.
Fill in the blank(s) with the appropriate word(s).