The bond that is created in H2O is called a covalent bond.
Being born a few days before your due date shouldn’t cause a big difference in your health. To gain weight you should try to eat thing high in protein, healthy fats, and some carbs. Most people try to gain weight by eating foods with a lot of saturated fat (is potato chips) but try to maintain a diet with a good calorie intake.
However I am not a professional and if you are worried about your weight, go to a nutritional to see what meal plan they will give you
This is what I try to eat, I am 100 pounds, 5.2, female.
Eggs (taste terrible in my opinion but are extremely nutritious) for breakfast
Salad with chicken for one meal
Meat dish with rice, or vegetables, sometimes spaghetti
I guess the stomach is held in place by a variety of Muscle cells, Epithelial cells, and connecting tissues; so the answer is: all of the above.
The inputs are glucose and oxygen and the outputs are water and carbon dioxide.
Its organism because it is one single thing.