"Community," "assemblage," "network," "complex," "interdependent," "web," and "synergism"--definitions of an ecosystem often include these words to highlight the dynamic interrelated workings of plants and animals with their physical environment. Young children don't understand the complexities of ecosystems, but they can begin to understand that only certain food sources meet the needs of an insect species, part of the National Science Education Content Standard C, Life Science, Characteristics of organisms, life cycles of organisms, and organisms and environments. (Contains 2 resources.)