Explain the changes in vegetation observed with increasing elevation. BONUS: Compare this to
changes in vegetation with latitude What will be an ideal response?
If one were to start at low elevation in the temperate deciduous forest biome and climb to higher
elevations one would pass from deciduous trees to coniferous trees to krummholz (twisted shrublike
trees), and finally to alpine tundra consisting of grasses and sedges. A similar variation in vegetation
would be seen moving northward from the equator (i.e., from temperate forest to boreal forest, to
arctic tundra).
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Changes that have occurred in living organisms over the past four billion years are due primarily to
A. extinction of species. B. continental drift. C. changes in geological periods. D. interaction of genetic and environmental changes. E. the change in the orbit of the moon, causing mass extinction due to volcanic activity.
The movement of water from the soil through the different plant cells is what type of
transport?
a. active b. passive c. facilitated diffusion d. fluid
Marine teleost fishes deal with the osmotic stress of living in seawater mainly by
a. active transport of ions into the body through the gills. b. excreting nitrogenous wastes through their kidneys as urea. c. active transport of ions out of the body by chloride cells. d. excreting excess salt through the actions of specialized salt glands in their heads. e. maintaining high levels of urea and trimethylamine oxide in body fluids.
The diploid number of chromosomes in mammals is always
A) 46. B) an odd number. C) 23. D) an even number. E) 2.