I Believe that when you are on summer break your less stressed you don't have to worry about things. If someone has an actual medical issue say if you have seizures' you'd rather be at home than worrying about it at school. I hope this helped.
A chromosome contains many genes that encode for proteins. .... a change to the newly synthesized DNA strand, but not the template
True, myocardial infarction is a heart attack. It happens when the flow of blood stops to a certain part of the heart causing damage to the heart muscle. The common symptom is chest pain feeling like you are having a heartburn.