Planarians and tapeworms are from Platyhelminthes, which contains flatworms.
<span>The cell cycle is the process by which cells progress and divide, lies at the heart of cancer. In normal cells, the cell cycle is controlled by a complex series of signaling pathways by which a cell grows, replicates its DNA and divides.</span>
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The number of children born to an average woman in a population during her entire reproductive life is called total fertility rate (TFR).
The total fertility rate (TFR) is the total number of children likely to be born to a woman in the population if she were subject to the childbearing years giving birth to children according to an existing schedule of age-specific fertility rate. The total fertility rate is obtained by adding the single-year age-specific rates at a specific time.