C) the lungs.
The air moves down the trachea and into the lungs where it is picked up by the blood
Viruses are not always classified as living cells because they cannot live independently. They rely on a host to provide all resources to live, without a host they are in a dormant, near dead like state. Therefore it has to define a virus as dead or alive as it may or may not have a host.
What happens to the population density and competition if the birth rate decreases?
The birth rate would increase is the population density competition increased.
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Fossil fuels release carbon dioxide gas when they burn which adds to the greenhouse effect and increases global warming. Of the three fossil fuels, for a given amount of energy released, coal produces the most carbon dioxide and natural gas produces the least.
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