Gills are used in respiration by all of the following aquatic animals EXCEPT
A. crabs.
B. polychaete worms.
C. fishes.
D. clams.
Answer: B
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Gestation takes approximately ____ days in humans
a. 279 b. 266 c. 231 d. 206 e. 178
Which of the following anemias is associated with premature red blood cell death?
a. aplastic b. megaloblastic anemia c. hemolytic anemia d. pernicious e. iron-deficiency anemia
Puberty begins with
A. the production of testosterone or estrogen. B. an increase in the amount of follicle stimulating hormone. C. the brain sensing the time is right. D. All of these answers are true.
According to the concept of punctuated equilibrium,
A) natural selection is unimportant as a mechanism of evolution. B) given enough time, most existing species will branch gradually into new species. C) a new species accumulates most of its unique features as it comes into existence. D) evolution of new species features long periods during which changes are occurring, interspersed with short periods of equilibrium or stasis. E) transitional fossils, intermediate between newer species and their parent species, should be abundant.