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.
Squamous cells area one single layer and flattened, this allows for diffusion of oxygen and carbon dioxide to happen easily in the lungs.
Answer:
D.
Explanation:
Soil formation takes a while, so it already being formed takes away alot of time. Hope this helps.
Answer:
nucleic acid are not found in the the cell membrane.
Explanation:
They are only found in ribosomes and the nucleus as either DNA or RNA
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