The answer is B) Parasitism
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Lymphocytes or natural killer
is one of the component of innate immune system where it acts as defense
mechanism of the body that are always present to mobilize and fight bacteria,
viruses and microbes at the site of infection.
Moreover, innate immune
system also refers to non-specific recognition of certain molecular
shapes on pathogens. Other components of innate immune system includes physical epithelial
barriers, phagocytic leukocytes, dendritic cells, and circulating plasma
proteins.
Because lung transplants can easily fail and most of the time lungs are so vulnerable to infection.
Of the Earth's liquid inventory, most of the fresh water is stored in the form of <u>Glaciers</u>.