The fact that couples and friends who have no genetic link may behave similarly toward food and assume similar degrees of leanness or fatness shows a(an) environmental link to weight loss and gain.
Genes are features or characteristic a person inherit from either of the parents or both of the parents.
Hence, people who have no genetic link may behave the same toward food they consume and as well assume the same degrees of weight loss or fatness shows an environmental link to weight loss and gain.
Learn more about genes here:https://brainly.com/question/1480756
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