Cells are surrounded by a plasma membrane<span>. The </span>membrane<span> is composed of a phospholipid bilayer arranged back-to-back. It'</span><span>s also covered with cholesterol molecules and proteins. The </span>plasma membrane picks what goes in and out of the cell
The physical characteristics of influenza viruses are that they are single-stranded, RNA viruses enclosed in a helical nucleocapsid. On the outside, these viruses are enveloped. Two important proteins are found on surface of this envelope: hemagglutinin and neurominidase.
Because nerves are the transmitters of messages from the brain to the structure, and all major nerves are found in the spinal cord leading out to the rest of the body. If the nervous tissue is damaged then the brain can no longer send messages to those parts of the body, and they an no longer react causint paralysis.
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Sometimes the Earthquake can contaminate the drinking water of a lower developed city/town which leaves the residents with no reliable and clean water source.