Volvox colonies. Light micrograph of colonies of the freshwater green alga Volvox aureus. The colony is a hollow sphere made up from thousands of cells connected by cytoplasmic threads and arranged in a single layer. Each cell has two flagella, which point outwards, and are used for locomotion. The green spheres within the colonies are daughter colonies, which are produced asexually. Magnification: x40 when printed at 10 centimetres wide.
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