A male from one species meets a female from its sister species. The male attempts to court the female, but the female refuses the male. This is an example of:

a. reproductive character displacement.
b. a hybrid zone.
c. prezygotic isolation.
d. postzygotic isolation.


C

Biology & Microbiology

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All of the following functions are performed by plant vacuoles EXCEPT:a

maintaining hydrostatic (turgor) pressure. b. waste storage and recycling. c. storage of proteins. d. breakdown of unneeded cellular materials. e. storage of nucleic acids.

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A rapid irregular contraction of the ventricles is known as ventricular ________

Fill in the blank(s) with correct word

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A protein's _______ structure contains helixes and sheets that result from hydrogen bonding between carboxyl and amino groups of the polypeptide chain.

A. primary B. secondary C. tertiary D. quaternary E. both secondary and quaternary

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Paired excretory organs found in most body segments of segmented worms are called ____

a. metanephridia b. parapodia c. septa d. clitella e. setae

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