What is the process by which water and nutrients are removed from the filtrate and returned to the blood?
A) Filtration
B) Excretion
C) Elimination
D) Reabsorption
E) Secretion
D
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Which of the traits listed in the map will recombine the most frequently?
a. short aristae length and black body color
b. long aristae and normal wings
c. short aristae length and brown eyes
d. vestigial wings and brown eyes
Why does countercurrent exchange optimize gas exchange across some gills?
a. It sustains an optimal thermal environment for gas exchange. b. It optimizes perfusion to the respiratory surface. c. It sustains an optimal respiratory gas concentration gradient, allowing diffusion to occur across the entire respiratory surface. d. It optimizes delivery of the respiratory medium to the respiratory surface. e. It minimizes diffusional area.
Birds and reptiles save water by eliminating __________ rich wastes as uric acid crystals. Fill in the blank(s) with the appropriate word(s)
Nucleotides have a phosphate group attached at which carbon atom of the sugar?
A. 3' B. 5' C. 2' D. 1'