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.
Answer:
Explanation: by interacting with the excretory system
Answer:
How many patients had allergies or ear infections, but not both?
24
27
36
40 answer
Explanation:
Answer:
blood consists of plasma, red blood cells, white blood cells, and platelets
Explanation:
