Natural selection affects or changes a population and not only an individual organism because as there are somethings to be changed in a certain organism to adapt to the changes in the environment, all organisms in a certain species will be able to adapt and the changes therefore is collective.
Bonds issued by the U.S. treasury are back by the federal reserve and claim to have no credit risk. Agency bonds also usually have low credit risk. otherwise you just have to look at the bond before you invest and find out what dink of credit risks are involved.
Answer I think the answer went to RNA
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If you are supposed to get your answer from the passage, one could gather that you need to maintain a healthy lifestyle to keep you growing so that these genes are not diminished, a leading factor in cancer.