The answer is GERD standing for Gastroesophageal reflux disease
The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils. Hope this helps.
<span>The question is asking us the following: you have an important exam next week and are very worried about it. What should you do to ease the stress? Some ideas include: 1) you should do sports, as physical activity is known to help with stress because it helps to maintain the chemical balance and it increases our happiness 2) you should make sure you drink enought water and sleep as not doing so will make you feel even more stressed - your body will be more resistant to stress</span>
