Which species interaction results in a negative impact on both species involved?
A. competition
B. predator/prey
C. parasite/host
D. commensalism
E. mutualism
Ans: A. competition
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The Neanderthal Genome Project discovered that some humans likely interbred with Neanderthals. Which group of humans probably did not?
Water diffuses through certain organs such as the kidneys and bladder much faster than would occur by passive diffusion through a lipid bilayer alone. What accounts for this more rapid rate of water transport in these organs?
A. The composition of lipids changes to promote water transport. B. Presence of aquaporin channels for facilitated diffusion of water. C. Presence of a water pump. D. Presence of an ATP-driven enzyme for water transport. E. The presence of molecules that bind water and change its membrane permeability properties.
The age structure diagram for countries with a
2.1 total fertility rate is indicated by a. A. b. B. c. C. d. D. e. none of these.
Urination depends on
A) blood proteins. B) water movement into the proximal tubule. C) the neural micturition reflex. D) the concentration of urea in the distal tubule. E) countercurrent exchange in the vasa recta.