You observe that two sympatric species occupy different ecological niches. What kind of barrier originally caused their speciation?
A. prezygotic
B. not enough information
C. postzygotic
Answer: B. not enough information
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The CD4 molecule is
A) an HIV surface glycoprotein. B) a cell-surface protein receptor for HIV. C) found only on T-helper cells. D) an HIV surface glycoprotein that is found only on T-helper cells.
The mesophyll of the leaf has which of the following characteristics?
A. It is located between the leaf veins. B. It is exposed to direct sunlight. C. It is mostly along the edges of the leaf. D. It is sometimes found in roots or stems. E. It is made up of palisade and spongy parenchyma cells.
In the general regression equation y = mx + b, variables m and b represent ________ and ________, respectively
A) the x-intercept, the y-intercept B) the regression line slope, the y-intercept C) the y-intercept, the regression line slope D) the y-intercept, the x-intercept E) narrow-sense heritability, broad-sense heritability
Cephalization refers to ____.
A. a type of symmetry B. neurons concentrated at the posterior end of an animal C. a net of neural cells D. neurons dispersed throughout the body E. neurons concentrated at the anterior end of an animal