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Some predators may often turn out to be prey of other predators .
B:Hunting may also be a solution to the problem caused by hunting .
C:The species of prey animals continue to vary despite humans ' hunting .
D:The number of prey animals keeps rising despite environmental change .
Animals Are More Intelligent Than Humans.
B:Animals Can Sense Natural Disasters.
C:Can Humans feel Rayleigh waves?
D:An Introduction to Animals' Six Senses.
A.robots are stronger and cleverer than humans
B:B.disabled people cannot look after themselves without the robots
C:C.robots will take the place of humans some day in the future
D:D.robots can help humans in many different ways .
humans are unique
B:humans respond to their world in a simple , mechanical fashion
C:there is an impenetrable wall between humans and all other living beings
D:animals are incapable of thought