The activation of DNA synthesis may result from the stimulatory activity of one or more cytoplasmic factors and In fusions of cells in G2 and S, however, nuclei continue their previous activities,
<span>a. Acoelomates. Flatworm is a type of acoelomate animal; they have no body cavity or ceolom but they have </span>mesenchyme in their body cavity that surrounds the gut and organs in one solid body.
