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Among predators there is a large degree of specialization. Many predators specialize in hunting only one species of prey. Others are more opportunistic and will kill and eat almost anything (examples: humans, leopards, dogs and alligators). The specialists are usually particularly well suited to capturing their preferred prey. The prey in turn, are often equally suited to escape that predator. This is called an evolutionary arms race and tends to keep the populations of both species in equilibrium. Some predators specialize in certain classes of prey, not just single species. Some will switch to other prey (with varying degrees of success) when the preferred target is extremely scarce, and they may also resort to scavenging or a herbivorous diet if possible.[citation needed]

What is the purpose of an evolutionary arms race?
Answer: keep the populations of both species in equilibrium
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In 1978, Sewall Wright suggested that human populations that have long inhabited separated parts of the world should, in general, be considered different subspecies by the usual criterion that most individuals of such populations can be allocated correctly by inspection. Wright argued that it does not require a trained anthropologist to classify an array of Englishmen, West Africans, and Chinese with 100% accuracy by features, skin color, and type of hair despite so much variability within each of these groups that every individual can easily be distinguished from every other. However, it is customary to use the term race rather than subspecies for the major subdivisions of the human species as well as for minor ones.

How should populations long inhabiting separate parts of the world be considered?
Answer: different subspecies
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In March 2013 Mendes said he would not return to direct the next film in the series, then known as Bond 24; he later recanted and announced that he would return, as he found the script and the plans for the long-term future of the franchise appealing. In directing Skyfall and Spectre, Mendes became the first director to oversee two consecutive Bond films since John Glen directed The Living Daylights and Licence to Kill in 1987 and 1989. Skyfall writer John Logan resumed his role of scriptwriter, collaborating with Neal Purvis and Robert Wade, who returned for their sixth Bond film.[N 4] The writer Jez Butterworth also worked on the script, alongside Mendes and Craig. Dennis Gassner returned as the film's production designer, while cinematographer Hoyte van Hoytema took over from Roger Deakins. In July 2015 Mendes noted that the combined crew of Spectre numbered over one thousand, making it a larger production than Skyfall. Craig is listed as co-producer.

Who was the last person to direct two James Bond movies in a row before Mendes?
Answer:
John Glen