Pigs have digitigrade locomotion because they walk on
(a) their ankles.
(b) the soles of their feet.
(c) the tips of their toes, which are modified as hooves.
(d) their hands and knees.
(d) their hands and knees.
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Which of the following regarding the haversian system is false?
A. Haversian canals may contain nerve fibers. B. Haversian canals run parallel to the length of long bone. C. It keeps osteocytes alive. D. Haversian canals are created by osteoclasts that tunnel through the bone matrix.
Scientific study of the population cycles of the snowshoe hare and its predator, the lynx, has revealed that
A) the prey population is controlled by predators alone. B) hares and lynx are so mutually dependent that each species cannot survive without the other. C) multiple biotic and abiotic factors contribute to the cycling of hare and lynx populations. D) both hare and lynx populations are regulated mainly by abiotic factors. E) the hare population is r-selected and the lynx population is K-selected.
Over the last 50 years, scientists have recorded an increase in the average atmospheric carbon dioxide. Which of the statements would be the best reason for these findings?
A) Removal of large sections of rain forests through deforestation. B) Testing equipment has become more sophisticated allowing scientists to get better results. C) Atmospheric carbon dioxide increases normally in a 50-year time span. D) More organisms exist on Earth's surface now compared with 50 years ago.
Who presented the idea of natural selection to the Linnaean Society in 1858?
A) Cuvier B) Darwin and Wallace C) Darwin D) Plato E) Lamarck