Yes. It is common for a normal, healthy individual to carry potentially pathogenic organisms in their upper respiratory tract.
The human upper respiratory tract serves as a reservoir for a diverse community of commensals and potential pathogens, such as Haemophilus influenzae, Moraxella catarrhalis,etc. which can occasionally develop into pathogens and cause infectious diseases. Viruses are responsible for the majority of upper respiratory tract infections.
Nasal hairs are used to catch debris. Particles are propelled upward and out of the respiratory tract by cilia on the epithelium of the trachea and bronchi. The respiratory system has a feature that guards against infections.
Therefore, It is common for a normal, healthy individual to carry potentially pathogenic organisms in their upper respiratory tract.
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Natural selection: organisms with certain inherited traits that are more likely to survive and reproduce than others.
These favorable traits can give an organism an advantage by giving them a higher chance of survival and reproduction. Darwin called this, "survival of the fittest"
<span><span>If these are the answers you were able to choose from:
A)Parents who live vicariously through their children are less likely to experience empty nest feelings.
</span><span>B)For most parents, marital satisfaction decreases during the years after child rearing.
</span><span>C)Parents who are heavily invested in their children may suffer from a decline in marital satisfaction after children have left home.
</span><span>D)<span>Marital partners have less time for each other with their children gone.
Then the correct answer would be C - parents who are heavily invested in their children may suffer from a decline in marital satisfaction after children have left home. This also makes sense; they've been parents and not husband and wife. For that reason, following the child's departure, they're not sure what to do with themselves.</span></span></span>
Carbon 14 is a radioactive isotope of carbon
When oxygen is scarce, pyruvic acid can accumulate and is converted to carbon dioxide and ethanol which causes formation of pyruvate to yield acetaldehyde
