Soil erosion can limit the quantity of crops a farmer can produce. which method can reduce soil erosion?
drip irritation
weathering
heavy tilling
less planting

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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.