Which term best describes the movement of ions and large molecules across membranes via transport proteins against their concentration gradient?
a. passive diffusion
b. a symport
c. facilitated diffusion
d. active transport
Ans: d. active transport
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Describe natural selection. Who first coined this phrase?
What will be an ideal response?
Reinforcement is an evolutionary process that occurs in a hybrid zone in which parental species adapt
to two different communities, and the hybrids thrive in an area of transition between the parental communities. _______ Indicate whether the statement is true or false.
The fossil record resembles the living species in the same geographic area. How does this pattern support the theory of evolution by natural selection?
A. It is evidence that Lamarck was right: Species become more complex over time. B. It is evidence of the law of succession. C. It is evidence of Aristotle's great chain of being. D. It is evidence that species can change over time.
Primary succession takes much longer than secondary succession because it involves
A. more time for development of a seed bank. B. colonization by more K-selected species. C. colonization by organisms that are farther away. D. time for development of the soil. E. redevelopment of the atmospheric gases.