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Volvox

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The Volvox is found in some canals and the like. It is one of the first animals to suggest the beginning of a body. It is a colony of a thousand or even ten thousand cells, but they are all cells of one kind. In multicellular animals the cells are of different kinds with different functions. Each of the ordinary cells (marked 5) has two lashes or flagella. Daughter colonies inside the Parent colony are being formed at 3, 4, and 2. The development of germ-cells is shown at 1.

Author
The Project Gutenberg EBook of The Outline of Science, Vol. 1 (of 4), by J. Arthur Thomson
Published in 1922
Available from gutenberg.org
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