Answer:
Healthy fingernails are smooth, without pits or grooves. They're uniform in color and consistency and free of spots or discoloration. Sometimes fingernails develop harmless vertical ridges that run from the cuticle to the tip of the nail. Vertical ridges tend to become more prominent with age.
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Explanation: Pathogen is an agent that can cause infection and disease.
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I’m not really sure I understand the question
Cilia is found in the trachea, they keep mucous and dirt etc out of the lungs
There are critical periods for a child's brain development.
