What nutrient is matched with its correct function? A
fats: main source of energy for the body
B
carbohydrates: building blocks of hormones and vitamins
с
proteins: used for growth and repair of the body
D
vitamins: secondary source of energy
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when it is at an intermediate population density

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.