When two species of meadowlarks with different mating songs are considered, which type of reproductive barrier is involved?

a. gametic
b. temporal
c. behavioral
d. habitat
e. mechanical


Answer: c. behavioral

Biology & Microbiology

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The fastest way for organisms to adapt to a changing environment involves _____

A) mutation B) asexual reproduction C) sexual reproduction

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The peripheral nervous system is composed of:

A. sensory neurons. B. cranial nerves. C. spinal nerves. D. All of the answer options are correct.

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In this figure showing SDS-PAGE of the progressive stages of glycine N-methyltransferase purification, the marker lane indicates that the purified protein:

A. has approximately 32,000 amino acids. B. has a molecular mass of approximately 32,000. C. has a positive charge and a molecular mass of approximately 32,000. D. has a negative charge and a molecular mass of approximately 32,000. E. is only present when cells are induced with glycine.

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Zoogloea form flocculent masses in

A) anaerobic sludge digestion. B) primary sewage treatment. C) activated sludge digestion. D) tertiary sewage treatment. E) water treatment.

Biology & Microbiology