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Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water..
This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..