Heavy rains cause the lava flow to erode and A1 and A2 are now sympatric. Was speciation sympatric?
What will be an ideal response?
Answers will vary.
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The surface on a neuron that discharges the contents of synaptic vesicles is the _____
A) dendrite B) axon hillock C) node of Ranvier D) postsynaptic membrane E) presynaptic membrane
Keratin is an important aspect of nonspecific defense because it
A. is toxic to pathogens. B. creates a physical barrier against pathogens. C. physically restricts pathogens to a specific region. D. destroys pathogens.
In humans, the 30S pre-RNA transcript yields three rRNA segments following transcription and RNA cleavage. What RNA transcripts are generated by the 30S pre-RNA transcript in E. coli?
A) two rRNAs (15S each) B) three rRNAs (5S, 16S, and 23S) C) two tRNA transcripts D) three rRNAs (5.8S, 18S, and 28S) and two tRNA transcripts E) three rRNAs (5S, 16S, and 23S) and two tRNA transcripts
Where are the major deserts of the world located?
A) 30° north and south of the equator B) 23.5° north and south of the equator C) 45° north and south of the equator D) the equator