Final answer:
Other species rarely becoming obese suggests adaptations differing from humans, where availability of high-calorie foods and genetic factors contribute to high obesity rates. Humans have a higher risk due to lifestyle and genetic predispositions, with some genes influencing appetite and metabolism.
Step-by-step explanation:
Other species rarely become obese, highlighting differences from humans regarding obesity. This fact suggests that while many animals in the wild have a pattern of storing excess calories as fat for times of scarcity, humans have developed obesity partly due to the availability of high-calorie foods coupled with insufficient exercise. Obesity in humans is also influenced by genetic factors, where genes control appetite and metabolism, predisposing individuals to obesity when food is abundant. High obesity rates in human populations have been linked to diets high in calories from excess carbohydrates and declines in activity level due to lifestyle changes, indicating a potential evolutionary adaptation among humans that is no longer advantageous in the current environment of food abundance.
Statement c, 'Fat has more calories than protein or carbohydrates,' is true regarding the composition of macro-nutrients and their caloric content. Additionally, the genetic makeup of an individual can significantly influence the regulation of metabolism, leading to variations in how their bodies manage excess food energy.