The similarities in function of hummingbird wings and the wings of a butterfly reflect

A) homology but not analogy.
B) homology through convergent evolution.
C) analogy and homology.
D) analogy but not homology.


Answer: D

Biology & Microbiology

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Which of the following statements about the causes of extinction are true? Check all that apply.  

_____  Probability of extinction varies inversely with population size. _____  Ten 10-hectare habitat patches is not the same as one 100-hectare patch. _____  Habitat loss is currently the major cause of extinction. _____  The prehistoric megafauna of North America were spared from extinction because they coevolved with humans. _____  Probability of extinction is greatest for an endemic species.

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The place that an organism resides is

(a) its community. (b) its habitat. (c) its population. (d) all of the above.

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Visible light has a wavelength range of

A. 200-400 nanometers. B. 200-740 nanometers. C. 400-740 nanometers. D. 0.001-100,000 nanometers. E. 200-800 nanometers.

Biology & Microbiology

Which statement is NOT true about retroviruses?

A. cDNA is used as a template to transcribe double-stranded DNA. B. They contain an enzyme called reverse transcriptase. C. HIV is a retrovirus. D. They incorporate themselves into the host cell genome, but replicate independently of the host DNA.

Biology & Microbiology