Conduct a structured observation of a real local outdoor area, recording abiotic and biotic factors and inferring at least one feeding relationship.
Ecologists learn about real ecosystems by going outside and recording exactly what they observe, carefully and honestly, rather than guessing from a book. A field study starts by choosing a small, defined area -- even a few square meters of backyard, sidewalk edge, or park counts. Then you record abiotic (nonliving) factors like temperature, sunlight, and soil moisture, and biotic (living) factors: every plant, insect, bird, or sign of an animal (tracks, chewed leaves, droppings) you can find.
The real payoff comes from using those observations to infer relationships: which organisms are likely producers, which are consumers, and whether you can find evidence of one organism eating, sheltering in, or depending on another. A single 20-minute study rarely tells the whole story of an ecosystem, but it is real data, gathered firsthand, which is worth more than a guess.
Mastery looks like: They can independently record several real abiotic and biotic factors from a chosen area and use them to infer at least one plausible feeding relationship.
Common stumbles: Only recording organisms while ignoring abiotic conditions; guessing at classifications rather than reasoning from what was actually observed.