When our ancestors were confronted by a saber tooth tiger, the ________ nervous system was responsible for "supercharging" their escape, while the ________ nervous system returned the body systems to normal after escaping the danger

Fill in the blank(s) with correct word


sympathetic; parasympathetic

Biology & Microbiology

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The fruit of the mistletoe, a parasitic angiosperm, is a one-seeded berry

In members of the genus Viscum, the outside of the seed is viscous (sticky), which permits the seed to adhere to surfaces such as the branches of host plants or the beaks of birds. What should be expected of the fruit if the viscosity of Viscum seeds is primarily an adaptation for dispersal rather than an adaptation for infecting host plant tissues? It should ______. A) be drab in color B) be colored so as to provide it with camouflage C) be nutritious to the dispersing organisms D) secrete enzymes that can digest bark

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Which of the following would one perfomr a D test?

A. organism demonstrates resistance to rifampin B. organism demonstrates resistance to eythromycin C. organism demonstrates resistance to gentamicin D. organism demonstrates resistance to ampicillin

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Since the Pleistocene ice age, deserts have been gradually forming in the southwestern United States

As the original lakes and rivers of this area shrank into isolated streams, ponds, and springs, the fishes living in them developed a strong potential for A) temporal isolation. B) speciation. C) mechanical incompatibility. D) hybridization. E) hybrid inviability.

Biology & Microbiology