Buffalo in the united states almost became extinct while cattle, an animal that provides similar products, never has been close to extinction. the difference is due to:

Cattle have never come close to extinction because they are considered to be privately owned, generating profits and social status for producers. On the other hand, buffalo is not of equal value to its human, so Americans became disinterested in breeding buffalo and this led to near extinction in the US.

Explanation:

Buffalo is a herbivorous mammal that belongs to the Bovidae family. It is a large animal that can measure up to 3 m in length and 1.7 m in height. Its weight can reach 900 kg. The African buffalo is wild and native to the savannas of that continent. Although much larger, buffaloes are similar to oxen in appearance. Even similar, buffalo does not have the same economic value as ox, at least in the Americas. This made the breeders disinterested in the buffalo, which led to an almost extinction of the animal on the American continent.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

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explanation: