Respiratory surfaces in all vertebrates have all of the listed features except
A. moist epithelia.
B. large surface areas.
C. thick epithelia.
D. a very high degree of vascularization.
C. thick epithelia.
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Answer the following statements true (T) or false (F)
1. Animals that do not control internal water concentration also typically do not control the concentrations of ions like sodium and potassium. 2. An animal that exhibits broad tolerance for changes in the salinity of its environment is said to be "euryhaline." 3. The materials in urine are ONLY those that are filtered from the blood or hemolymph and not reabsorbed by the body following filtration. 4. The filtrate that leaves the proximal convoluted tubule is much more concentrated than the blood in humans. 5. The blood supply to the loop of Henle also exhibits a countercurrent arrangement.
Genes that affect the __________ system often affect behavior. Fill in the blank(s) with the appropriate word(s)
Vast __________ form in the interior of midlatitude
continents. Fill in the blank(s) with the appropriate word(s).
Why do tropical rainforests exist in soils that are nutrient-poor?
A) There is a low rate of decomposition, and plants cannot absorb the "undigested" nutrients. B) There is a low rate of decomposition, and plants quickly absorb the nutrients as they are available. C) There is a high rate of decomposition, and plants quickly absorb the nutrients as they are available. D) The plants cannot use the types of nutrients produced by tropical decomposers.