Problem: Microcosms "are useful for studying the way ecosystems Microcosms "are useful for studying the way ecosystems work and for the very practical purpose of determining work and for the very practical purpose of determining what happens to toxic substances in ecosystems. what happens to toxic substances in ecosystems. Microcosms are important because they are a way to study Microcosms are important because they are a way to study whole, simplified ecosystems, and because they can be whole, simplified ecosystems, and because they can be replicated for experimental studies at reasonable cost" replicated for experimental studies at reasonable cost" (Beyers & Odum, 1993).(Beyers & Odum, 1993). Need Assignment Help?