A smooth pattern of variation along a geographical gradient is referred to as a ____
a. ring species
b. hybrid zone
c. morphological species
d. cline
e. cluster of subspecies
D
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Why are changes in the global carbon cycle important?
I) Burning reduces available carbon for primary producers and, therefore, primary consumers. II) Deforestation and suburbanization reduce an area's net primary productivity. III) Increasing atmospheric concentrations of carbon dioxide could alter Earth's climate. IV) By using fossil fuels we are destroying a nonrenewable resource. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, III, and IV
A white blood cell engulfing a bacterial cell would be an example of which of the following?
a. phagocytosis b. pinocytosis c. receptor-mediated endocytosis d. exocytosis
In marine sponges, intracellular digestion of peptides is usually immediately preceded by _____
A) hydrolysis B) phagocytosis C) absorption D) secretion
The R-squared of a regression is 1 - X, where X is the:
A. sum of squared predictions divided by the total sum of squares. B. sum of squared residuals divided by the sum of squared predictions. C. sum of squared predictions divided by the sum of squared residuals. D. sum of squared residuals divided by the total sum of squares.