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Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..