Answer:
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Genetic Drift can result in the loss of where alleles I can decrease the size of the alleles genetic drift can also cause a new population to be genetically distinct from its original population which has led to the hypothesis that genetic drift plays a role in the evolution of new species
Sorry don’t know and I need help with something else so
The valves are responsible for preventing blood from flowing in the wrong direction, they are present in the veins, and the arteries don't need them because the aorta (biggest artery) pumps or in other words pushes it with such a force that no other force can change its direction, in the veins there is no structure present for pumping them as a result we have got valves so that they go in one direction...... the meaning of the word valve is to allow in one direction