I think it is natural selection. genetic variation also could be a factor for physical variation over the years.
To ensure safety, leftovers that have been properly wrapped and refrigerated should be eaten within<u> three days.</u>
Leftovers can be kept for three to four days in the refrigerator. We should be sure to eat them within that time. After that, the risk of food poisoning increases. Food poisoning is the result of eating contaminated, spoiled, or toxic food. hence, to avoid such condition food must be consumed within shortest duration possible.
Learn more about Food Poisoning here:
brainly.com/question/16327379
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Answer: If Shayna is continuously being bothered by these remarks then she should as him to stop. If that does not work or if it starts getting physical she should report it to an older person she can trust if she is a minor, if not then report it to the authorities.