Final Answer:
1. Abiotic things: sun, water, soil, air, rocks.
Primary producers: grass, trees, algae.
Primary consumers: rabbit, grasshopper, deer.
Secondary consumers: hawk, fox, snake.
Decomposers: fungi, bacteria, earthworms.
2. If the sun stops shining, plants can’t make food (photosynthesis stops), so they die. Then animals that eat plants starve, and predators lose their food too — the whole ecosystem collapses.
3. If there’s no rain for months, plants dry up and die. Animals lose food and water, so many die or leave. The ecosystem becomes dry and barren (like a desert).
4. If hawks become very large in number, they eat too many rabbits, mice, and snakes. Those prey populations drop sharply, and then hawks themselves run out of food and start dying off.
5. If raw sewage leaks into the stream:
- Water gets polluted with harmful bacteria and chemicals.
- Fish and insects may die from poisoning or lack of oxygen.
- Animals drinking the water get sick.
- Algae may grow too much (algae bloom), blocking sunlight and killing underwater life.
6. Three other actions and effects:
- Cutting down all the trees → soil erodes, animals lose homes, less oxygen produced.
- Introducing a non-native fish → it eats native fish eggs, causing native species to disappear.
- Overfishing in the stream → fewer fish left, birds and otters that eat fish go hungry.
Parent Tip: Review the logic above to help your child master the concept of what is an ecosystem worksheet.
