Speciation, the formation of new species, occurs when some individuals can no longer interbreed with the rest of the group.

What will be an ideal response?


the formation of new species, occurs when some individuals can no longer interbreed with the rest of the group.

Biology & Microbiology

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Which of the following is routinely used to detect spirochetes in skin lesions in early syphilis?

A. Phase-contrast microscopy B. Dark-field microscopy C. DNA fingerprinting D. Bright-field microscopy

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The hippocampus, amygdala, and hypothalamus are the major components of the ______ system.  

A.  sympathetic B.  reflex C.  parasympathetic D.  limbic E.  autonomic

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Which immune system cell must be presented with antigen by an antigen-presenting cell such as a macrophage, in order to become appropriately activated?

A) B lymphocyte B) plasma cell C) macrophage D) T lymphocyte E) natural killer cell

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When glucose (C6H12O6) is oxidized to CO2 and water in cellular respiration, approximately 40% of the energy content of glucose is transferred to

A) the citric acid cycle. B) glycolysis. C) ATP (adenosine triphosphate). D) heat. E) oxygen (O2).

Biology & Microbiology