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:
A
Explanation:
Grass, wood and leather can be brocken down
Answer:
genomics
Explanation:
it's is the study of genes and DNA ( deoxyribonucleic acid)