Examlex
What is a welfare state? Can the United States be classified as a welfare state?
Macrophages
A type of white blood cell that engulfs and digests cellular debris, foreign substances, and pathogens.
Body Defense Mechanism
The biological structures and processes within an organism that protect against disease by identifying and killing pathogens and tumor cells.
Pathogen
An organism such as a bacteria, virus, fungus, or parasite that can cause disease in its host.
Blood Vessels
Hollow structures that facilitate blood movement within the body, covering arteries, veins, and capillaries.
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