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Explanation: Scientists believe that Archaebacteria are the survivors of an ancient group of organisms that bridge the evolutionary gap between prokaryotes and eukaryotes. Eukaryotes are the true evolved cells and they differ from prokaryotes
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d) harvesting and threshing both.
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The species of <em>Anthoxanthum odoratum</em> is an example of parapatric species. 
- Speciation is a process in which a new species form from the existing species due to reproductive isolation. 
- In parapatric speciation there is no barrier between the gene flow between similar species.
- In the parapatric speciation populations are adapted to different ecological conditions although the populations of the related species differ in terms of mutation, and due to the effect of drift.  
- But they are connected by the random flow of genes between the neighboring organisms irrespective of the changes in their genetic and physiological form. 
Learn more about speciation: 
brainly.com/question/9288164