Bacteria is literally just germs. It is on literally everything in the world. You wash your hands to remove the dirt and clean them. Bacteria is what your cleaning.
<h2>Answer: Differentiation from visibly undifferentiated precursor cells occur during embryonic development, during metamorphosis of larval forms, and following the separation of parts in asexual reproduction. It also takes place in adult organisms during the renewal of tissues and the regeneration of missing parts. </h2>
