According to the biological species concept, speciation consists of the evolution of biological barriers to gene flow. The most important distinction is between _______ and _______ barriers.

A. male; female
B. sexual selection; natural selection
C. temporal; spatial
D. ecological; evolutionary
E. prezygotic; postzygotic


Answer: E. prezygotic; postzygotic

Biology & Microbiology

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Select the best response to the question. ?What is a consequence of untreated tapeworm?

A) anal itching B) abscesses C) anemia D) seizures

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What will be an ideal response?

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