Behavioral traits are useful in distinguishing among species because
a. behaviors are always genetically determined.
b. courtship behaviors and timing of mating may create prezygotic isolation.
c. behaviors are easy to assess in dead and fossilized specimens.
d. behaviors are independent of morphological characteristics.
e. behaviors are always learned
B
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Cytopathic effects are changes in host cells due to
A) viral infections. B) protozoan infections. C) fungal infections. D) bacterial infections. E) helminthic infections.
Which statement is true about the type of light used by plants to make sugar during photosynthesis?
A) Its wavelength is similar to X rays. B) Its wavelength is similar to radio waves. C) It comes from within the visible portion of the electromagnetic spectrum. D) It is infrared. E) It is very high energy with long wavelengths.
Conventional secondary biological treatment removes ONLY about 20 percent of phosphorus, so which of the following additional treatments is OFTEN necessary?
a. chemical precipitation with iron b. removal by phosphorus-degrading organisms (PDOs) c. removal by phosphorus-accumulating organisms (PAOs) d. both a and c
Sympatric speciation differs from allopatric speciation because in sympatric speciation
A. there are no physical barriers against interbreeding. B. a population becomes geographically isolated. C. hybrid zones form. D. polyploidy must first arise. E. two populations of the same species merge to form a single population.