The Nacza Plate subducted beneath the South American Plate
Answer:
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Explanation:
Europe and Asia. The boundary between Europe and Asia is unusual among continental boundaries because of its largely mountain-and-river-based characteristics north and east of the Black Sea. The reason is historical, the division of Europe and Asia going back to the early Greek geographers. Europe is considered a separate continent from Asia because of its distinct historical, cultural and political identity, rather than any clear geographical demarcation. ... A large part of Turkey lies in Asia, however, culturally and politically, it has been closer to Europe and therefore sees itself as a European country
Answer:
In the mid-1800s, over-hunting of Northern Elephant Seals reduced their population size to fewer than 40 individuals. However, the population has since rebounded to over 100,000 animals. The population went through a _<u>bottle neck event (genetic drift)</u>_, which makes it more susceptible to _<u>developing a genetic disease</u>_.
Explanation:
Genetic drift is the random change that occurs in the allelic frequency of a population through generations. The magnitude of this change is inversely related to the size of the original population. These changes produced by genetic drift accumulate in time. Eventually, some alleles get lost, while some others might set. Genetic drift affects a population and reduces its size dramatically due to a disaster or pressure-bottleneck effect- or because of a population split -founder effect-
. The bottleneck effect most likely affects smaller populations.
In the exposed example, extensive hunting acted as a pressure that reduced the number of Northern elephant seals to fewer than 100. This population experienced one or many generations of small size since these animals were affected by hunting. As the survivors did not have the whole genetic pool of the original population, the <em>population size might have recovered to a current population size of 100,000 individuals</em><em>,</em><em> but the genetic pool might have not</em><em>.</em> When the small population increases in size, it will have a genetically different composition from the original one. In these situations,<em> there is a reduced genetic variability, with a possibility of developing a peculiar allelic component</em>. If the <em>survivors in the population carried or developed a mutation, probably this mutation passed from generation to generation</em>. It will involve <em>more individuals each time and</em><em> increase the probability of developing a genetic disease.</em>
Answer:
Option B
Explanation:
Peptidoglycan is a polymer that made of amino acids and sugar. This forms a layer of mesh like structure which is found on the outer side of the plasma membrane.
This is found in most of the bacteria which forms the cell wall. The sugar component that contains the alternating residues of N-acetylglucosamine and N-acetyl muramic acid.
Thus, the correct answer is option B
