A discontinued line in an evolutionary tree indicates
A. extinction.
B. gradualism.
C. punctuated equilibrium.
D. convergent evolution.
E. temporal isolation.
A. extinction.
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Filopodia and lamellipodia are associated with which cytoskeletal element?
a. microfilaments b. microtubules c. intermediate filaments d. chromatin e. cellulose. microtubules.
Indicate which factors support the industrial melanism hypothesis. Check all that apply.
_____ Pollution inhibits the growth of dark colored lichen. _____ Dark moths have greater camouflage on trees in polluted woodlands. _____ Pollutants darken bark surfaces. _____ Light moths have greater camouflage on trees in highly polluted woodlands.
In the late 1960's, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars
After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. Why did species diversity most likely remain high in the presence of a predator? A. The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring. B. The sea star kept the mussel and barnacles from developing a mutualistic relationship. That, in turn, kept their populations low. C. The mussel and the barnacle parasitized the sea star, keeping populations low enough to prevent competitive exclusion from occurring. D. The sea star developed a mutalistic relationship with the mussel and barnacle, keeping their populations low and preventing competitive exclusion from happening.
The class of proteobacteria that may be incorporated into the gamma proteobacteria is the ________.
A. delta proteobacteria B. alpha proteobacteria C. beta proteobacteria D. epsilon proteobacteria