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Which of the following is the most costly and least risky method of converting from one system to another?
Physical Barrier
A form of defense mechanism in the body or environment that physically blocks or prevents the entry of pathogens.
Macrophages
A type of immune cell that engulfs and digests cellular debris, foreign substances, microbes, and cancer cells in a process called phagocytosis.
Ultraviolet Light
Electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays, having various effects on health and the environment.
Vitamin D
A fat-soluble vitamin that helps in the absorption of calcium, facilitating normal immune function and bone health.
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