What is ethching?

What is the difference between the alimentary canal and the accessory digestive organs? What is the greatest concern when the alveoli are filled with fluid? What can drinking 2 bottles of castor oil do to baby at 32 weeks? Is RBC is living even it lacks nucleus? Do you need to go to the hospital I got in acar crash yesterday i have whipflash really bad and to deeep scrapes and I have bruises and my ribs im sore and it hurts to breathe and lie down and eat? How does syphilis affect the immune system? Hard belly and missed period? Which type of cell is destroyed by the AIDS virus? What animal eats human brains? Who discovered Wilms' tumor? Can you eat stuff when your tooth is wiggly? What is the main visible specialization for absorption of substances in the intestine cells? What are the chances if your period one day early and it only lasted for one day two months in a row? Where are flamingos found only in? What are the parameters of a full-blown Aids? Can diphtheria have any long term effects in later life? What are photosensitive epileptic seizures? What does PAP look like? What should you do to increase your blood platlets? Your stomach is an organ protected by what?