The answer is D.They reproduce independently. It is false because they need a host and can't survive by themselves.
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If Lorenzo would quit smoking,reduce his intake of alcohol and improve his healthy eating behaviors and also increasing his physical activity it would mean his lifestyle changes would then increase telomerase activity. Increase telomerase is one way of the body to deal with stress and for the protection of DNA from destruction.
This is called the metabolism. Hope this helps.
There are so many examples for that in different areas, like steroidal compounds experiment carried out in our lab recently.
Here's one link: http://www.alfa-chemistry.com/products/steroidal-compounds-8.htm