In a hypothetical situation, a certain species of flea feeds only on pronghorn antelopes. In the western United States, pronghorns and cattle often associate with one another in the same open rangeland
Some of these fleas develop a strong preference for cattle blood and mate only with other fleas that prefer cattle blood. The host mammal can be considered as the fleas' habitat. If this situation persists, and new species evolve, this would be an example of _____. A) sympatric speciation and habitat isolation
B) sympatric speciation and temporal isolation
C) allopatric speciation and habitat isolation
D) allopatric speciation and gametic isolation
A
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What results from the chemical reaction illustrated above? The reactants have no charge
A) a cation with a net charge of +1 and an anion with a net charge of +1 B) a cation with a net charge of -1 and an anion with a net charge of -1 C) a cation with a net charge of -1 and an anion with a net charge of +1 D) a cation with a net charge of +1 and an anion with a net charge of -1
Cacti in the deserts of southwestern North America and some euphorbs of the deserts of Africa, have barrel-shaped stems, short-lived leaves, and spines, yet these two types of plants are from different evolutionary lineages. This is an example of
A. selective breeding. B. transitional forms. C. homologous traits. D. convergent evolution.
The letter “A” in the above figure represents
a. keratin-filled, dead epithelial cells. b. replicating epithelium. c. mucus produced by underlying ciliated cells. d. white blood cells attacking a bacterial cell. e. all of these.
Any physical or chemical agent that brings about an increase in congenital malformations is called a(n) ____
a. teratogen b. hormone c. ARX factor d. cytocin e. trophoblast