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Under certain circumstances some cells may store up food matters beome eggs, while others, known as sperm-cells, develop a flagellum. These reproductive cells separating from the colony they swim actively uniting with an egg. This union of two individuals in Vorticella results inthe power of division. The cells produced remain together, form a spere, and finally develop a Volvox colony.

Volvox

Under certain circumstances some cells may store up food matters beome eggs, while others, known as…