Answer: c not all cells have a nucleus (prokaryotic cells don’t)
Explanation:
<span>The answer should be B. The results of a previous experiment are presented as an introduction to a new experiment.
Material that used for </span>presentation of background research should have a credible information. A<span>mazing new drug is described in a television commercial mostly false and it is not backed up by scientific study. Rumor from </span><span>second-hand accounts definitely not credible. A newspaper is not a scientific study and could give false information.</span>
