What is the difference between cortical nephrons and juxtamedullary nephrons?
a. Juxtamedullary nephrons are more numerous than cortical ones.
b. Cortical nephrons do not have loops of Henle, while juxtamedullary ones do.
c. Juxtamedullary nephrons have larger glomeruli than do cortical ones.
d. Juxtamedullary nephrons do not have loops of Henle, while cortical ones do.
e. Juxtamedullary nephrons have more glomeruli than do cortical ones
c
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Elephants are large animals because they
a. have bigger cells. b. possess expandable cells. c. are made of a greater number of cells. d. have bigger cells and are made of a greater number of cells. e. have bigger cells that are expandable and of greater number
Red algae can live in deeper water because of their
a. phycobilins. b. holdfasts. c. chlorophyll a. d. stonelike cell walls. e. preference for freshwater habitats.
How do stabilizing and disruptive selection differ?
A. Stabilizing selection produces adaptation. Disruptive selection is nonadaptive. B. With stabilizing selection, the phenotype for a trait does not influence survival. With disruptive selection, the phenotype for a trait affects survival. C. Stabilizing selection reduces the amount of variation in a trait. Disruptive selection increases the amount of variation in a trait. D. With stabilizing selection, extreme individuals have high biological fitness. With disruptive selection, extreme individuals have low biological fitness.
Which of the following contribute to atmospheric CO2 levels? (Check all that apply.)
A. Chemoautotrophy B. Respiration C. Photosynthesis D. Deforestation E. Burning fossil fuel