Cave-dwelling catfish and cave-dwelling salamanders share striking similarities: Both organisms lack pigmentation, and their eyes are reduced or absent. The most recent common ancestor to these organisms had normal pigmentation and fully developed eyes
The similarities between cave catfish and cave salamanders are an example of
A) phylogeny.
B) analogy.
C) homology.
D) exaptation.
Answer: B
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Before the evolution of complex nervous systems, animals with very simple nervous systems could engage in the following behaviors, except:
A. finding a mate. B. obtaining food. C. choosing a suitable habitat. D. regulating internal body functions. E. sensing chemical cues in the environment.
are Retroviruses lysogenic or lytic?
What will be an ideal response?
Descriptions of new species of insects are more likely to contain diagrams of the shape of the male genitalia than head, wing, or leg parts. Why?
A. Arthropods have hard exoskeletons so head, wing, and leg structures can't vary as much. B. This is the convention or custom of entomology. C. Radiation damage to genes usually occurs in genitalia. D. Small changes in the genitalia cause reproductive isolation while a single species can tolerate wider variation in head, wing, and leg morphology. E. This is where mutations usually express themselves in animals.
convection
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