Science Class 8
How Nature Works in Harmony
Who eats whom, kinds of ecosystem, and what moves when one leaves.
14 lessons · ~74 min total
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Lessons in this topic
- 0 Start here A roadmap: food chains, clean-up, people, ecosystem kinds and living together. · 3 min You are here
- 1 Living and non-living, in one place Living parts and non-living parts of a place, joined together, form an ecosystem. · 6 min
- 2 One kind, or all kinds Many of one kind in a place are a population. All the populations there are a community. · 5 min
- 3 Where the food starts Plants make their own food. Animals must eat. Herbivores, carnivores and omnivores differ in what they eat. · 6 min
- 4 Along the chain A food chain shows who eats whom. Each step is a trophic level. · 6 min
- 5 Chains join into a web Many eaters have more than one food, so chains join into a food web. · 6 min
- 6 The crew that puts it back Decomposers break down dead plants and animals and return nutrients to the soil. · 6 min
- 7 Pull one link and the rest move When one kind changes in number, others change too. Balance can break. · 6 min
- 8 People are in the picture too People change ecosystems, and ecosystems give people a lot. Both follow the same links. · 6 min
- 9 Water, land and farms Ecosystems are aquatic, terrestrial or human-made. Some are large, some are small. · 5 min
- 10 Living together: who gains? Living things compete, and some live close together. Name who gains. · 6 min
- 11 Checkpoint: kinds of ecosystem and relationships A graded check on aquatic and terrestrial ecosystems and on who gains. · 5 min
- 12 The big picture Ten ideas about how living and non-living things fit together. · 3 min
- 13 Track quiz The ten rules the labs use, then one question on each idea. · 5 min
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