Temperature, pressure and composition.
Answer:
Increased fitness of large-beaked birds, leading to natural selection
(Why: Birds with larger beaks are better able to survive in the new enviornment)
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Answer: Young children
Explanation: Resistance to food borne illnesses develops through exposure to small amounts of food borne pathogens. The longer the exposure, the greater the buildup of immunity. Young children are more likely to succumb to food borne illnesses due to lack of exposure to pathogens, and resultant lack of resistance to them.