6 to 8 hrs for digestion. it stays in the stomach for 2 hours and then in the intestine for another 2 hours. the undigested food goes to the large intestine and the digested food goes to whole body through blood. Carbhydrates and proteins about 1 1/2 -2 hrs. Fats 2 hrs.
And based on that a foetus does not posses self-awareness. Human babies have been found to become self aware between the ages of 18-24 months. The rouge test is a self-recognition test that identifies a human child's ability to recognize a reflection in a mirror as his or her own.
Well, youâre not really âjoining in,â because you arenât copying the yawn on any conscious level. It happens because you just canât help it. If you become self-conscious about a yawn, it stops. Studies have shown that seeing pictures or videos of yawning faces can provoke contagious yawning. What we might think of as the main component of a âyawn faceââa wide-open mouthâdoesnât even need to appear in the image for the trigger to work, âyawning eyesâ can be enough to get us arching and gaping.