Age, health, heredity, ovulation cycle, location, and miscarriage are all the main biological factors which affect birth.
1: inferior vena cava
2: aorta
3: superior vena cava
4: pulmonary vein
The three C's (character, collateral, and capacity)
The answer is esophagus. The esophagus is the tube that squeezes the food down to the stomach by peristalsis. This part connects the throat and the stomach. It is a tube lined with mucous membrane.
