Answer:
Your question is poorly written, but as far as what was read the best thing would be a longitudinal study since you could see the evolution over time of the twins.
Explanation:
Longitudinal studies, unlike cross-sectional studies, are studies that analyze a factor in a population over time, thus analyzing the possible variables that occurred in those years, months or days. In simple words, the evolution over time is what a longitudinal study is based on (On the other hand, not a transversal one, since it would investigate a specific problem at a specific moment in time)
goes to the lungs, and then re-enters the heart; Deoxygenated blood leaves through the right ventricle through the pulmonary artery. From the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.
For the last two weeks my 11 year old son has been experiencing nausea and vomiting in the mornings on school days in particular. The first week I believe he had a virus because he was vomiting and dizzy and I had the same thing for that week. That weekend he seemed fine, eating spaghetti,ice cream and so on but Monday morning he was throwing up again. I got a call from the school nurse saying he was in her office wanting to come home. He is throwing up but I don't know what the heck. I have tried eliminating meds, foods and so on and trying to find out if something was going on at school that he was trying to avoi
Options? and I think its skeletal system.